嵌入式开发试题1-100
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嵌入式开发试题1-100
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嵌入式開發試題1-100題目1:有1、2、3、4個數字,能組成多少個互不相同且無重復數字的三位數?都是多少?1.程序分析:可填在百位、十位、個位的數字都是1、2、3、4。組成所有的排列后再去掉不滿足條件的排列。 main(){ int i,j,k;printf("\n");for(i=1;i<5;i++) /*以下為三重循環*/for(j=1;j<5;j++) for (k=1;k<5;k++){if (i!=k&&i!=j&&j!=k) /*確保i、j、k三位互不相同*/printf("%d,%d,%d\n",i,j,k);}}題目2:企業發放的獎金根據利潤提成。利潤(I)低于或等于10萬元時,獎金可提10%;利潤高于10萬元,低于20萬元時,低于10萬元的部分按10%提成,高于10萬元的部分,可可提成7.5%;20萬到40萬之間時,高于20萬元的部分,可提成5%;40萬到60萬之間時高于40萬元的部分,可提成3%;60萬到100萬之間時,高于60萬元的部分,可提成1.5%,高于100萬元時,超過100萬元的部分按1%提成,從鍵盤輸入當月利潤I,求應發放獎金總數?1.程序分析:請利用數軸來分界,定位。注意定義時需把獎金定義成長整型。 main(){ long int i;int bonus1,bonus2,bonus4,bonus6,bonus10,bonus;scanf("%ld",&i);bonus1=100000*0.1;bonus2=bonus1+100000*0.75;bonus4=bonus2+200000*0.5;bonus6=bonus4+200000*0.3;bonus10=bonus6+400000*0.15;if(i<=100000)bonus=i*0.1;else if(i<=200000)bonus=bonus1+(i-100000)*0.075;else if(i<=400000)bonus=bonus2+(i-200000)*0.05;else if(i<=600000)bonus=bonus4+(i-400000)*0.03;else if(i<=1000000)bonus=bonus6+(i-600000)*0.015;elsebonus=bonus10+(i-1000000)*0.01;printf("bonus=%d",bonus);} 題目3:一個整數,它加上100后是一個完全平方數,再加上168又是一個完全平方數,請問該數是多少?1.程序分析:在10萬以內判斷,先將該數加上100后再開方,再將該數加上268后再開方,如果開方后的結果滿足如下條件,即是結果。請看具體分析:#include "math.h"main(){ long int i,x,y,z;for (i=1;i<100000;i++){ x=sqrt(i+100); /*x為加上100后開方后的結果*/y=sqrt(i+268); /*y為再加上168后開方后的結果*/if(x*x==i+100&&y*y==i+268)/*如果一個數的平方根的平方等于該數,這說明此數是完全平方數*/printf("\n%ld\n",i);}}題目4:輸入某年某月某日,判斷這一天是這一年的第幾天?1.程序分析:以3月5日為例,應該先把前兩個月的加起來,然后再加上5天即本年的第幾天,特殊情況,閏年且輸入月份大于3時需考慮多加一天。main(){ int day,month,year,sum,leap;printf("\nplease input year,month,day\n");scanf("%d,%d,%d",&year,&month,&day);switch(month)/*先計算某月以前月份的總天數*/{case 1:sum=0;break;case 2:sum=31;break;case 3:sum=59;break;case 4:sum=90;break;case 5:sum=120;break;case 6:sum=151;break;case 7:sum=181;break;case 8:sum=212;break;case 9:sum=243;break;case 10:sum=273;break;case 11:sum=304;break;case 12:sum=334;break;default:printf("data error");break;}sum=sum+day; /*再加上某天的天數*/if(year%400==0||(year%4==0&&year%100!=0))/*判斷是不是閏年*/leap=1;elseleap=0;if(leap==1&&month>2)/*如果是閏年且月份大于2,總天數應該加一天*/sum++;printf("It is the %dth day.",sum);}題目5:輸入三個整數x,y,z,請把這三個數由小到大輸出。1.程序分析:我們想辦法把最小的數放到x上,先將x與y進行比較,如果x>y則將x與y的值進行交換,然后再用x與z進行比較,如果x>z則將x與z的值進行交換,這樣能使x最小。main(){ int x,y,z,t;scanf("%d%d%d",&x,&y,&z);if (x>y){t=x;x=y;y=t;} /*交換x,y的值*/if(x>z){t=z;z=x;x=t;}/*交換x,z的值*/if(y>z){t=y;y=z;z=t;}/*交換z,y的值*/printf("small to big: %d %d %d\n",x,y,z);}題目6:輸出特殊圖案,請在c環境中運行,看一看,Very Beautiful!1.程序分析:字符共有256個。不同字符,圖形不一樣。 #include "stdio.h"main(){ char a=176,b=219;printf("%c%c%c%c%c\n",b,a,a,a,b);printf("%c%c%c%c%c\n",a,b,a,b,a);printf("%c%c%c%c%c\n",a,a,b,a,a);printf("%c%c%c%c%c\n",a,b,a,b,a);printf("%c%c%c%c%c\n",b,a,a,a,b);}題目7:輸出9*9口訣。1.程序分析:分行與列考慮,共9行9列,i控制行,j控制列。#include "stdio.h"main(){int i,j,result;printf("\n");for (i=1;i<10;i++){ for(j=1;j<10;j++){result=i*j;printf("%d*%d=%-3d",i,j,result);/*-3d表示左對齊,占3位*/}printf("\n");/*每一行后換行*/}}題目8:要求輸出國際象棋棋盤。1.程序分析:用i控制行,j來控制列,根據i+j的和的變化來控制輸出黑方格,還是白方格。#include "stdio.h"main(){ int i,j;for(i=0;i<8;i++){for(j=0;j<8;j++)if((i+j)%2==0)printf("%c%c",219,219);elseprintf(" ");printf("\n");}}題目9:打印樓梯,同時在樓梯上方打印兩個笑臉。 1.程序分析:用i控制行,j來控制列,j根據i的變化來控制輸出黑方格的個數。#include "stdio.h"main(){ int i,j;printf("\1\1\n");/*輸出兩個笑臉*/for(i=1;i<11;i++){for(j=1;j<=i;j++)printf("%c%c",219,219);printf("\n");}}題目10:古典問題:有一對兔子,從出生后第3個月起每個月都生一對兔子,小兔子長到第三個月后每個月又生一對兔子,假如兔子都不死,問每個月的兔子總數為多少?1.程序分析: 兔子的規律為數列1,1,2,3,5,8,13,21....main(){ long f1,f2;int i;f1=f2=1;for(i=1;i<=20;i++){ printf("%12ld %12ld",f1,f2);if(i%2==0) printf("\n");/*控制輸出,每行四個*/f1=f1+f2; /*前兩個月加起來賦值給第三個月*/f2=f1+f2; /*前兩個月加起來賦值給第三個月*/}}題目11:判斷101-200之間有多少個素數,并輸出所有素數。1.程序分析:判斷素數的方法:用一個數分別去除2到sqrt(這個數),如果能被整除,則表明此數不是素數,反之是素數。 2.程序源代碼:#include "math.h"main(){int m,i,k,h=0,leap=1;printf("\n");for(m=101;m<=200;m++){ k=sqrt(m+1);for(i=2;i<=k;i++)if(m%i==0){leap=0;break;}if(leap) {printf("%-4d",m);h++;if(h%10==0)printf("\n");}leap=1;}printf("\nThe total is %d",h);}題目12:打印出所有的“水仙花數”,所謂“水仙花數”是指一個三位數,其各位數字立方和等于該數本身。例如:153是一個“水仙花數”,因為153=1的三次方+5的三次方+3的三次方。1.程序分析:利用for循環控制100-999個數,每個數分解出個位,十位,百位。main(){int i,j,k,n;printf("'water flower'number is:");for(n=100;n<1000;n++){i=n/100;/*分解出百位*/j=n/10%10;/*分解出十位*/k=n%10;/*分解出個位*/if(i*100+j*10+k==i*i*i+j*j*j+k*k*k){printf("%-5d",n);}}printf("\n");}題目13:將一個正整數分解質因數。例如:輸入90,打印出90=2*3*3*5。程序分析:對n進行分解質因數,應先找到一個最小的質數k,然后按下述步驟完成: (1)如果這個質數恰等于n,則說明分解質因數的過程已經結束,打印出即可。(2)如果n<>k,但n能被k整除,則應打印出k的值,并用n除以k的商,作為新的正整數你n,重復執行第一步。(3)如果n不能被k整除,則用k+1作為k的值,重復執行第一步。main(){int n,i;printf("\nplease input a number:\n");scanf("%d",&n);printf("%d=",n);for(i=2;i<=n;i++){while(n!=i){if(n%i==0){ printf("%d*",i);n=n/i;}elsebreak;}}printf("%d",n);}題目14:利用條件運算符的嵌套來完成此題:學習成績>=90分的同學用A表示,60-89分之間的用B表示,60分以下的用C表示。1.程序分析:(a>b)?a:b這是條件運算符的基本例子。main(){int score;char grade;printf("please input a score\n");scanf("%d",&score);grade=score>=90?'A'score>=60?'B':'C');printf("%d belongs to %c",score,grade);}題目15:輸入兩個正整數m和n,求其最大公約數和最小公倍數。1.程序分析:利用輾除法。main(){int a,b,num1,num2,temp;printf("please input two numbers:\n");scanf("%d,%d",&num1,&num2);if(num1<num2)/*交換兩個數,使大數放在num1上*/{ temp=num1;num1=num2; num2=temp;}a=num1;b=num2;while(b!=0)/*利用輾除法,直到b為0為止*/{temp=a%b;a=b;b=temp;}printf("gongyueshu:%d\n",a);printf("gongbeishu:%d\n",num1*num2/a);}題目16:輸入一行字符,分別統計出其中英文字母、空格、數字和其它字符的個數。1.程序分析:利用while語句,條件為輸入的字符不為'\n'. #include "stdio.h"main(){ char c;int letters=0,space=0,digit=0,others=0;printf("please input some characters\n");while((c=getchar())!='\n'){if(c>='a'&&c<='z'||c>='A'&&c<='Z')letters++;else if(c==' ')space++;else if(c>='0'&&c<='9')digit++;elseothers++;}printf("all in all:char=%d space=%d digit=%d others=%d\n",letters,space,digit,others);}題目17:求s=a+aa+aaa+aaaa+aa...a的值,其中a是一個數字。例如2+22+222+2222+22222(此時共有5個數相加),幾個數相加有鍵盤控制。1.程序分析:關鍵是計算出每一項的值。main(){int a,n,count=1;long int sn=0,tn=0;printf("please input a and n\n");scanf("%d,%d",&a,&n);printf("a=%d,n=%d\n",a,n);while(count<=n){tn=tn+a;sn=sn+tn;a=a*10;++count;}printf("a+aa+...=%ld\n",sn);}題目18:一個數如果恰好等于它的因子之和,這個數就稱為“完數”。例如6=1+2+3.編程找出1000以內的所有完數。1. 程序分析:請參照程序<--上頁程序14. main(){static int k[10];int i,j,n,s;for(j=2;j<1000;j++){n=-1;s=j;for(i=1;i<j;i++){if((j%i)==0){ n++;s=s-i;k[n]=i;}}if(s==0){printf("%d is a wanshu",j);for(i=0;i<N;I++)printf("%d,",k);printf("%d\n",k[n]);}}}題目19:一球從100米高度自由落下,每次落地后反跳回原高度的一半;再落下,求它在第10次落地時,共經過多少米?第10次反彈多高?1.程序分析:見下面注釋main(){ float sn=100.0,hn=sn/2;int n;for(n=2;n<=10;n++){sn=sn+2*hn;/*第n次落地時共經過的米數*/hn=hn/2; /*第n次反跳高度*/}printf("the total of road is %f\n",sn);printf("the tenth is %f meter\n",hn);}題目20:猴子吃桃問題:猴子第一天摘下若干個桃子,當即吃了一半,還不癮,又多吃了一個第二天早上又將剩下的桃子吃掉一半,又多吃了一個。以后每天早上都吃了前一天剩下的一半零一個。到第10天早上想再吃時,見只剩下一個桃子了。求第一天共摘了多少。1.程序分析:采取逆向思維的方法,從后往前推斷。main(){ int day,x1,x2;day=9;x2=1;while(day>0){ x1=(x2+1)*2;/*第一天的桃子數是第2天桃子數加1后的2倍*/x2=x1;day--;}printf("the total is %d\n",x1);}題目21:兩個乒乓球隊進行比賽,各出三人。甲隊為a,b,c三人,乙隊為x,y,z三人。已抽簽決定比賽名單。有人向隊員打聽比賽的名單。a說他不和x比,c說他不和x,z比,請編程序找出三隊賽手的名單。 1.程序分析:判斷素數的方法:用一個數分別去除2到sqrt(這個數),如果能被整除,則表明此數不是素數,反之是素數。 main(){char i,j,k;/*i是a的對手,j是b的對手,k是c的對手*/for(i='x';i<='z';i++)for(j='x';j<='z';j++){if(i!=j)for(k='x';k<='z';k++){ if(i!=k&&j!=k){ if(i!='x'&&k!='x'&&k!='z')printf("order is a--%c\tb--%c\tc--%c\n",i,j,k);}}}}題目22:打印出如下圖案(菱形)****************************1.程序分析:先把圖形分成兩部分來看待,前四行一個規律,后三行一個規律,利用雙重for循環,第一層控制行,第二層控制列。 main(){int i,j,k;for(i=0;i<=3;i++){for(j=0;j<=2-i;j++)printf(" ");for(k=0;k<=2*i;k++)printf("*");printf("\n");}for(i=0;i<=2;i++){for(j=0;j<=i;j++)printf(" ");for(k=0;k<=4-2*i;k++)printf("*");printf("\n");}}題目23:有一分數序列:2/1,3/2,5/3,8/5,13/8,21/13...求出這個數列的前20項之和。1.程序分析:請抓住分子與分母的變化規律。 main(){ int n,t,number=20;float a=2,b=1,s=0;for(n=1;n<=number;n++){s=s+a/b;t=a;a=a+b;b=t;/*這部分是程序的關鍵,請讀者猜猜t的作用*/}printf("sum is %9.6f\n",s);}題目24:求1+2!+3!+...+20!的和1.程序分析:此程序只是把累加變成了累乘。 main(){ float n,s=0,t=1;for(n=1;n<=20;n++){t*=n;s+=t;}printf("1+2!+3!...+20!=%e\n",s);}題目25:利用遞歸方法求5!。1.程序分析:遞歸公式:fn=fn_1*4!#include "stdio.h"main(){ int i;int fact();for(i=0;i<5;i++)printf("\40:%d!=%d\n",i,fact(i));}int fact(j)int j;{int sum;if(j==0)sum=1;elsesum=j*fact(j-1);return sum;}題目26:利用遞歸函數調用方式,將所輸入的5個字符,以相反順序打印出來。#include "stdio.h"main(){ int i=5;void palin(int n);printf("\40:");palin(i);printf("\n");}void palin(n)int n;{char next;if(n<=1){next=getchar();printf("\n\0:");putchar(next);}else{next=getchar();palin(n-1);putchar(next);}}題目27:有5個人坐在一起,問第五個人多少歲?他說比第4個人大2歲。問第4個人歲數,他說比第3個人大2歲。問第三個人,又說比第2人大兩歲。問第2個人,說比第一個人大兩歲。最后 問第一個人,他說是10歲。請問第五個人多大?1.程序分析:利用遞歸的方法,遞歸分為回推和遞推兩個階段。要想知道第五個人歲數,需知道第四人的歲數,依次類推,推到第一人(10歲),再往回推。age(n)int n;{ int c;if(n==1) c=10;else c=age(n-1)+2;return(c);}main(){ printf("%d",age(5));}題目28:給一個不多于5位的正整數,要求:一、求它是幾位數,二、逆序打印出各位數字。1. 程序分析:學會分解出每一位數,如下解釋:(這里是一種簡單的算法,師專數002班趙鑫提供) main( ){ long a,b,c,d,e,x;scanf("%ld",&x);a=x/10000;/*分解出萬位*/b=x%10000/1000;/*分解出千位*/c=x%1000/100;/*分解出百位*/d=x%100/10;/*分解出十位*/e=x%10;/*分解出個位*/if (a!=0) printf("there are 5, %ld %ld %ld %ld %ld\n",e,d,c,b,a);else if (b!=0) printf("there are 4, %ld %ld %ld %ld\n",e,d,c,b);else if (c!=0) printf(" there are 3,%ld %ld %ld\n",e,d,c);else if (d!=0) printf("there are 2, %ld %ld\n",e,d);else if (e!=0) printf(" there are 1,%ld\n",e);}題目29:一個5位數,判斷它是不是回文數。即12321是回文數,個位與萬位相同,十位與千位相同。 main( ){ long ge,shi,qian,wan,x;scanf("%ld",&x);wan=x/10000;qian=x%10000/1000;shi=x%100/10;ge=x%10;if (ge==wan&&shi==qian)/*個位等于萬位并且十位等于千位*/printf("this number is a huiwen\n");elseprintf("this number is not a huiwen\n");}題目30:請輸入星期幾的第一個字母來判斷一下是星期幾,如果第一個字母一樣,則繼續判斷第二個字母。1.程序分析:用情況語句比較好,如果第一個字母一樣,則判斷用情況語句或if語句判斷第二個字母。#include <stdio.h>void main(){char letter;printf("please input the first letter of someday\n");while ((letter=getch())!='Y')/*當所按字母為Y時才結束*/{ switch (letter){case 'S':printf("please input second letter\n");if((letter=getch())=='a')printf("saturday\n");else if ((letter=getch())=='u')printf("sunday\n");else printf("data error\n");break;case 'F':printf("friday\n");break;case 'M':printf("monday\n");break;case 'T':printf("please input second letter\n");if((letter=getch())=='u')printf("tuesday\n");else if ((letter=getch())=='h')printf("thursday\n");else printf("data error\n");break;case 'W':printf("wednesday\n");break;default: printf("data error\n");}}}題目31:Press any key to change color, do you want to try it. Please hurry up!#include <conio.h>void main(void){ int color;for (color = 0; color < 8; color++){ textbackground(color);/*設置文本的背景顏色*/cprintf("This is color %d\r\n", color);cprintf("ress any key to continue\r\n");getch();/*輸入字符看不見*/}}題目32:學習gotoxy()與clrscr()函數 #include <conio.h>void main(void){ clrscr();/*清屏函數*/textbackground(2);gotoxy(1, 5);/*定位函數*/cprintf("Output at row 5 column 1\n");textbackground(3);gotoxy(20, 10);cprintf("Output at row 10 column 20\n");}題目33:練習函數調用#include <stdio.h>void hello_world(void){printf("Hello, world!\n");}void three_hellos(void){int counter;for (counter = 1; counter <= 3; counter++)hello_world();/*調用此函數*/}void main(void){three_hellos();/*調用此函數*/}題目34:文本顏色設置#include <conio.h>void main(void){int color;for (color = 1; color < 16; color++){textcolor(color);/*設置文本顏色*/cprintf("This is color %d\r\n", color);}textcolor(128 + 15);cprintf("This is blinking\r\n");}題目35:求100之內的素數 #include <stdio.h>#include "math.h"#define N 101main(){int i,j,line,a[N];for(i=2;i<N;i++) a=i;for(i=2;i<sqrt(N);i++)for(j=i+1;j<N;j++){if(a!=0&&a[j]!=0)if(a[j]%a==0)a[j]=0;}printf("\n");for(i=2,line=0;i<N;i++){if(a!=0){printf("%5d",a);line++;}if(line==10){printf("\n");line=0;}}}題目36:對10個數進行排序1.程序分析:可以利用選擇法,即從后9個比較過程中,選擇一個最小的與第一個元素交換,下次類推,即用第二個元素與后8個進行比較,并進行交換。 #define N 10main(){int i,j,min,tem,a[N];/*input data*/printf("please input ten num:\n");for(i=0;i<N;i++){printf("a[%d]=",i);scanf("%d",&a);}printf("\n");for(i=0;i<N;i++)printf("%5d",a);printf("\n");/*sort ten num*/for(i=0;i<N-1;i++){min=i;for(j=i+1;j<N;j++)if(a[min]>a[j]) min=j;tem=a;a=a[min];a[min]=tem;}/*output data*/printf("After sorted \n");for(i=0;i<N;i++)printf("%5d",a);}題目37:求一個3*3矩陣對角線元素之和 1.程序分析:利用雙重for循環控制輸入二維數組,再將a累加后輸出。main(){float a[3][3],sum=0;int i,j;printf("please input rectangle element:\n");for(i=0;i<3;i++)for(j=0;j<3;j++)scanf("%f",&a[j]);for(i=0;i<3;i++)sum=sum+a;printf("duijiaoxian he is %6.2f",sum);}題目38:有一個已經排好序的數組。現輸入一個數,要求按原來的規律將它插入數組中。1. 程序分析:首先判斷此數是否大于最后一個數,然后再考慮插入中間的數的情況,插入后此元素之后的數,依次后移一個位置。 main(){ int a[11]={1,4,6,9,13,16,19,28,40,100};int temp1,temp2,number,end,i,j;printf("original array is:\n");for(i=0;i<10;i++)printf("%5d",a);printf("\n");printf("insert a new number:");scanf("%d",&number);end=a[9];if(number>end)a[10]=number;else{for(i=0;i<10;i++){ if(a>number){temp1=a;a=number;for(j=i+1;j<11;j++){temp2=a[j];a[j]=temp1;temp1=temp2;}break;}}}for(i=0;i<11;i++)printf("%6d",a);}題目39:將一個數組逆序輸出。1.程序分析:用第一個與最后一個交換。#define N 5main(){ int a[N]={9,6,5,4,1},i,temp;printf("\n original array:\n");for(i=0;i<N;i++)printf("%4d",a);for(i=0;i<N/2;i++){ temp=a;a=a[N-i-1];a[N-i-1]=temp;}printf("\n sorted array:\n");for(i=0;i<N;i++)printf("%4d",a);}題目40:學習static定義靜態變量的用法 #include "stdio.h"varfunc(){ int var=0;static int static_var=0;printf("\40:var equal %d \n",var);printf("\40:static var equal %d \n",static_var);printf("\n");var++;static_var++;}void main(){ int i;for(i=0;i<3;i++)varfunc();}題目41:學習使用auto定義變量的用法#include "stdio.h"main(){ int i,num;num=2;for (i=0;i<3;i++){ printf("\40: The num equal %d \n",num);num++;{auto int num=1;printf("\40: The internal block num equal %d \n",num);num++;}}}題目42:學習使用static的另一用法。 #include "stdio.h"main(){int i,num;num=2;for(i=0;i<3;i++){printf("\40: The num equal %d \n",num);num++;}static int num=1;printf("\40:The internal block num equal %d\n",num);num++;}題目43:學習使用external的用法。#include "stdio.h"int a,b,c;void add(){ int a;a=3;c=a+b;}void main(){ a=b=4;add();printf("The value of c is equal to %d\n",c);}題目44:學習使用register定義變量的方法。void main(){ register int i;int tmp=0;for(i=1;i<=100;i++)tmp+=i;printf("The sum is %d\n",tmp);}題目45:宏#define命令練習(1) #include "stdio.h"#define TRUE 1#define FALSE 0#define SQ(x) (x)*(x)void main(){ int num;int again=1;printf("\40: Program will stop if input value less than 50.\n");while(again){printf("\40lease input number==>");scanf("%d",&num);printf("\40:The square for this number is %d \n",SQ(num));if(num>=50)again=TRUE;elseagain=FALSE;}}題目46:宏#define命令練習(2)#include "stdio.h"#define exchange(a,b){ \ /*宏定義中允許包含兩道衣裳命令的情形,此時必須在最右邊加上"\"*/int t;t=a;\a=b;b=t;\ }void main(void){ int x=10;int y=20;printf("x=%d; y=%d\n",x,y);exchange(x,y);printf("x=%d; y=%d\n",x,y);}題目47:宏#define命令練習(3) #define LAG >#define SMA <#define EQ ==#include "stdio.h"void main(){ int i=10;int j=20;if(i LAG j)printf("\40: %d larger than %d \n",i,j);else if(i EQ j)printf("\40: %d equal to %d \n",i,j);else if(i SMA j)printf("\40:%d smaller than %d \n",i,j);elseprintf("\40: No such value.\n");}題目48:#if #ifdef和#ifndef的綜合應用。#include "stdio.h"#define MAX#define MAXIMUM(x,y) (x>y)?x:y#define MINIMUM(x,y) (x>y)?y:xvoid main(){ int a=10,b=20;#ifdef MAXprintf("\40: The larger one is %d\n",MAXIMUM(a,b));#elseprintf("\40: The lower one is %d\n",MINIMUM(a,b));#endif#ifndef MINprintf("\40: The lower one is %d\n",MINIMUM(a,b));#elseprintf("\40: The larger one is %d\n",MAXIMUM(a,b));#endif#undef MAX#ifdef MAXprintf("\40: The larger one is %d\n",MAXIMUM(a,b));#elseprintf("\40: The lower one is %d\n",MINIMUM(a,b));#endif#define MIN#ifndef MINprintf("\40: The lower one is %d\n",MINIMUM(a,b));#elseprintf("\40: The larger one is %d\n",MAXIMUM(a,b));#endif}題目49:#include 的應用練習 test.h 文件如下:#define LAG >#define SMA <#define EQ ==#include "test.h" /*一個新文件50.c,包含test.h*/#include "stdio.h"void main(){ int i=10;int j=20;if(i LAG j)printf("\40: %d larger than %d \n",i,j);else if(i EQ j)printf("\40: %d equal to %d \n",i,j);else if(i SMA j)printf("\40:%d smaller than %d \n",i,j);elseprintf("\40: No such value.\n");}題目50:學習使用按位與 & 。1.程序分析:0&0=0; 0&1=0; 1&0=0; 1&1=1#include "stdio.h"main(){ int a,b;a=077;b=a&3;printf("\40: The a & b(decimal) is %d \n",b);b&=7;printf("\40: The a & b(decimal) is %d \n",b);} 收藏 分享 評分 -回復 引用 訂閱 TOP tonyInterviews 發短消息 加為好友 tonyInterviews UID1 帖子722 精華0 積分0 閱讀權限200 在線時間33 小時 注冊時間2008-2-4 最后登錄2009-2-13 管理員2# 發表于 2008-2-4 14:55 | 只看該作者 踩窩窩 送禮物 問候Ta 題目51:學習使用按位或 | 。1.程序分析:0|0=0; 0|1=1; 1|0=1; 1|1=1 #include "stdio.h"main(){ int a,b;a=077;b=a|3;printf("\40: The a & b(decimal) is %d \n",b);b|=7;printf("\40: The a & b(decimal) is %d \n",b);}題目52:學習使用按位異或 ^ 。 1.程序分析:0^0=0; 0^1=1; 1^0=1; 1^1=0#include "stdio.h"main(){ int a,b;a=077;b=a^3;printf("\40: The a & b(decimal) is %d \n",b);b^=7;printf("\40: The a & b(decimal) is %d \n",b);}題目53:取一個整數a從右端開始的4~7位。程序分析:可以這樣考慮: 1)先使a右移4位。(2)設置一個低4位全為1,其余全為0的數。可用~(~0<<4)(3)將上面二者進行&運算。main(){ unsigned a,b,c,d;scanf("%o",&a);b=a>>4;c=~(~0<<4);d=b&c;printf("%o\n%o\n",a,d);}題目54:學習使用按位取反~。 1.程序分析:~0=1; ~1=0;#include "stdio.h"main(){ int a,b;a=234;b=~a;printf("\40: The a's 1 complement(decimal) is %d \n",b);a=~a;printf("\40: The a's 1 complement(hexidecimal) is %x \n",a);} 題目55:畫圖,學用circle畫圓形。 #include "graphics.h"main(){ int driver,mode,i;float j=1,k=1;driver=VGA;mode=VGAHI;initgraph(&driver,&mode,"");setbkcolor(YELLOW);for(i=0;i<=25;i++){setcolor(8);circle(310,250,k);k=k+j;j=j+0.3;}} 題目56:畫圖,學用line畫直線。#include "graphics.h"main(){ int driver,mode,i;float x0,y0,y1,x1;float j=12,k;driver=VGA;mode=VGAHI;initgraph(&driver,&mode,"");setbkcolor(GREEN);x0=263;y0=263;y1=275;x1=275;for(i=0;i<=18;i++){setcolor(5);line(x0,y0,x0,y1);x0=x0-5;y0=y0-5;x1=x1+5;y1=y1+5;j=j+10;}x0=263;y1=275;y0=263;for(i=0;i<=20;i++){setcolor(5);line(x0,y0,x0,y1);x0=x0+5;y0=y0+5;y1=y1-5;}}題目57:畫圖,學用rectangle畫方形。 1.程序分析:利用for循環控制100-999個數,每個數分解出個位,十位,百位。#include "graphics.h"main(){int x0,y0,y1,x1,driver,mode,i;driver=VGA;mode=VGAHI;initgraph(&driver,&mode,"");setbkcolor(YELLOW);x0=263;y0=263;y1=275;x1=275;for(i=0;i<=18;i++){setcolor(1);rectangle(x0,y0,x1,y1);x0=x0-5;y0=y0-5;x1=x1+5;y1=y1+5;}settextstyle(DEFAULT_FONT,HORIZ_DIR,2);outtextxy(150,40,"How beautiful it is!");line(130,60,480,60);setcolor(2);circle(269,269,137);}題目58:畫圖,綜合例子。# define PAI 3.1415926# define B 0.809# include "graphics.h"#include "math.h"main(){int i,j,k,x0,y0,x,y,driver,mode;float a;driver=CGA;mode=CGAC0;initgraph(&driver,&mode,"");setcolor(3);setbkcolor(GREEN);x0=150;y0=100;circle(x0,y0,10);circle(x0,y0,20);circle(x0,y0,50);for(i=0;i<16;i++){a=(2*PAI/16)*i;x=ceil(x0+48*cos(a));y=ceil(y0+48*sin(a)*B);setcolor(2); line(x0,y0,x,y);}setcolor(3);circle(x0,y0,60);/* Make 0 time normal size letters */settextstyle(DEFAULT_FONT,HORIZ_DIR,0);outtextxy(10,170,"press a key");getch();setfillstyle(HATCH_FILL,YELLOW);floodfill(202,100,WHITE);getch();for(k=0;k<=500;k++){setcolor(3);for(i=0;i<=16;i++){a=(2*PAI/16)*i+(2*PAI/180)*k;x=ceil(x0+48*cos(a));y=ceil(y0+48+sin(a)*B);setcolor(2); line(x0,y0,x,y);}for(j=1;j<=50;j++){a=(2*PAI/16)*i+(2*PAI/180)*k-1;x=ceil(x0+48*cos(a));y=ceil(y0+48*sin(a)*B);line(x0,y0,x,y);}}restorecrtmode();}題目59:畫圖,綜合例子。 #include "graphics.h"#define LEFT 0#define TOP 0#define RIGHT 639#define BOTTOM 479#define LINES 400#define MAXCOLOR 15main(){int driver,mode,error;int x1,y1;int x2,y2;int dx1,dy1,dx2,dy2,i=1;int count=0;int color=0;driver=VGA;mode=VGAHI;initgraph(&driver,&mode,"");x1=x2=y1=y2=10;dx1=dy1=2;dx2=dy2=3;while(!kbhit()){line(x1,y1,x2,y2);x1+=dx1;y1+=dy1;x2+=dx2;y2+dy2;if(x1<=LEFT||x1>=RIGHT)dx1=-dx1;if(y1<=TOP||y1>=BOTTOM)dy1=-dy1;if(x2<=LEFT||x2>=RIGHT)dx2=-dx2;if(y2<=TOP||y2>=BOTTOM)dy2=-dy2;if(++count>LINES){setcolor(color);color=(color>=MAXCOLOR)?0:++color;}}closegraph();}題目60:打印出楊輝三角形(要求打印出10行如下圖) 1.程序分析:11 11 2 11 3 3 11 4 6 4 11 5 10 10 5 1 main(){int i,j;int a[10][10];printf("\n");for(i=0;i<10;i++){a[0]=1;a=1;}for(i=2;i<10;i++)for(j=1;j<i;j++)a[j]=a[i-1][j-1]+a[i-1][j];for(i=0;i<10;i++){for(j=0;j<=i;j++)printf("%5d",a[j]);printf("\n");}}題目61:學習putpixel畫點。#include "stdio.h"#include "graphics.h"main(){int i,j,driver=VGA,mode=VGAHI;initgraph(&driver,&mode,"");setbkcolor(YELLOW);for(i=50;i<=230;i+=20)for(j=50;j<=230;j++)putpixel(i,j,1);for(j=50;j<=230;j+=20)for(i=50;i<=230;i++)putpixel(i,j,1);}題目62:畫橢圓ellipse #include "stdio.h"#include "graphics.h"#include "conio.h"main(){int x=360,y=160,driver=VGA,mode=VGAHI;int num=20,i;int top,bottom;initgraph(&driver,&mode,"");top=y-30;bottom=y-30;for(i=0;i<num;i++){ellipse(250,250,0,360,top,bottom);top-=5;bottom+=5;}getch();}題目63:利用ellipse and rectangle 畫圖。#include "stdio.h"#include "graphics.h"#include "conio.h"main(){int driver=VGA,mode=VGAHI;int i,num=15,top=50;int left=20,right=50;initgraph(&driver,&mode,"");for(i=0;i<num;i++){ellipse(250,250,0,360,right,left);ellipse(250,250,0,360,20,top);rectangle(20-2*i,20-2*i,10*(i+2),10*(i+2));right+=5;left+=5;top+=10;}getch();}題目64:一個最優美的圖案。 #include "graphics.h"#include "math.h"#include "dos.h"#include "conio.h"#include "stdlib.h"#include "stdio.h"#include "stdarg.h"#define MAXPTS 15#define PI 3.1415926struct PTS {int x,y;};double AspectRatio=0.85;void LineToDemo(void){struct viewporttype vp;struct PTS points[MAXPTS];int i, j, h, w, xcenter, ycenter;int radius, angle, step;double rads;printf(" MoveTo / LineTo Demonstration" );getviewsettings( &vp );h = vp.bottom - vp.top;w = vp.right - vp.left;xcenter = w / 2; /* Determine the center of circle */ycenter = h / 2;radius = (h - 30) / (AspectRatio * 2);step = 360 / MAXPTS; /* Determine # of increments */angle = 0; /* Begin at zero degrees */for( i=0 ; i<MAXPTS ; ++i ){ /* Determine circle intercepts */rads = (double)angle * PI / 180.0; /* Convert angle to radians */points.x = xcenter + (int)( cos(rads) * radius );points.y = ycenter - (int)( sin(rads) * radius * AspectRatio );angle += step; /* Move to next increment */}circle( xcenter, ycenter, radius ); /* Draw bounding circle */for( i=0 ; i<MAXPTS ; ++i ){ /* Draw the cords to the circle */for( j=i ; j<MAXPTS ; ++j ){ /* For each remaining intersect */moveto(points.x, points.y); /* Move to beginning of cord */lineto(points[j].x, points[j].y); /* Draw the cord */} } }main(){int driver,mode;driver=CGA;mode=CGAC0;initgraph(&driver,&mode,"");setcolor(3);setbkcolor(GREEN);LineToDemo();} 題目65:輸入3個數a,b,c,按大小順序輸出。 1.程序分析:利用指針方法。main(){int n1,n2,n3;int *pointer1,*pointer2,*pointer3;printf("please input 3 number:n1,n2,n3:");scanf("%d,%d,%d",&n1,&n2,&n3);pointer1=&n1;pointer2=&n2;pointer3=&n3;if(n1>n2) swap(pointer1,pointer2);if(n1>n3) swap(pointer1,pointer3);if(n2>n3) swap(pointer2,pointer3);printf("the sorted numbers are:%d,%d,%d\n",n1,n2,n3);}swap(p1,p2)int *p1,*p2;{int p;p=*p1;*p1=*p2;*p2=p;}題目66:輸入數組,最大的與第一個元素交換,最小的與最后一個元素交換,輸出數組。1.程序分析:譚浩強的書中答案有問題。main(){int number[10];input(number);max_min(number);output(number);}input(number)int number[10];{int i;for(i=0;i<9;i++)scanf("%d,",&number);scanf("%d",&number[9]);}max_min(array)int array[10];{int *max,*min,k,l;int *p,*arr_end;arr_end=array+10;max=min=array;for(p=array+1;p<arr_end;p++)if(*p>*max) max=p;else if(*p<*min) min=p;k=*max;l=*min;*p=array[0];array[0]=l;l=*p;*p=array[9];array[9]=k;k=*p;return;}output(array)int array[10];{ int *p;for(p=array;p<array+9;p++)printf("%d,",*p);printf("%d\n",array[9]);}題目67:有n個整數,使其前面各數順序向后移m個位置,最后m個數變成最前面的m個數main(){int number[20],n,m,i;printf("the total numbers is:");scanf("%d",&n);printf("back m:");scanf("%d",&m);for(i=0;i<n-1;i++)scanf("%d,",&number);scanf("%d",&number[n-1]);move(number,n,m);for(i=0;i<n-1;i++)printf("%d,",number);printf("%d",number[n-1]);}move(array,n,m)int n,m,array[20];{int *p,array_end;array_end=*(array+n-1);for(p=array+n-1;p>array;p--)*p=*(p-1);*array=array_end;m--;if(m>0) move(array,n,m);}題目68:有n個人圍成一圈,順序排號。從第一個人開始報數(從1到3報數),凡報到3的人退出圈子,問最后留下的是原來第幾號的那位。#define nmax 50main(){int i,k,m,n,num[nmax],*p;printf("please input the total of numbers:");scanf("%d",&n);p=num;for(i=0;i<n;i++)*(p+i)=i+1;i=0;k=0;m=0;while(m<n-1){if(*(p+i)!=0) k++;if(k==3){ *(p+i)=0;k=0;m++;}i++;if(i==n) i=0;}while(*p==0) p++;printf("%d is left\n",*p);}題目69:寫一個函數,求一個字符串的長度,在main函數中輸入字符串,并輸出其長度。 main(){int len;char *str[20];printf("please input a string:\n");scanf("%s",str);len=length(str);printf("the string has %d characters.",len);}length(p)char *p;{int n;n=0;while(*p!='\0'){n++;p++;}return n;}題目70:編寫input()和output()函數輸入,輸出5個學生的數據記錄。#define N 5struct student{ char num[6];char name[8];int score[4];} stu[N];input(stu)struct student stu[];{ int i,j;for(i=0;i<N;i++){ printf("\n please input %d of %d\n",i+1,N);printf("num: ");scanf("%s",stu.num);printf("name: ");scanf("%s",stu.name);for(j=0;j<3;j++){ printf("score %d.",j+1);scanf("%d",&stu.score[j]);}printf("\n");}}print(stu)struct student stu[];{ int i,j;printf("\nNo. Name Sco1 Sco2 Sco3\n");for(i=0;i<N;i++){ printf("%-6s%-10s",stu.num,stu.name);for(j=0;j<3;j++)printf("%-8d",stu.score[j]);printf("\n");}}main(){input();print();}題目71:創建一個鏈表。#include "stdlib.h"#include "stdio.h"struct list{ int data;struct list *next;};typedef struct list node;typedef node *link;void main(){ link ptr,head;int num,i;ptr=(link)malloc(sizeof(node));ptr=head;printf("please input 5 numbers==>\n");for(i=0;i<=4;i++){scanf("%d",&num);ptr->data=num;ptr->next=(link)malloc(sizeof(node));if(i==4) ptr->next=NULL;else ptr=ptr->next;}ptr=head;while(ptr!=NULL){ printf("The value is ==>%d\n",ptr->data);ptr=ptr->next;}}題目72:反向輸出一個鏈表。 #include "stdlib.h"#include "stdio.h"struct list{ int data;struct list *next;};typedef struct list node;typedef node *link;void main(){ link ptr,head,tail; int num,i;tail=(link)malloc(sizeof(node));tail->next=NULL;ptr=tail;printf("\nplease input 5 data==>\n");for(i=0;i<=4;i++){scanf("%d",&num);ptr->data=num;head=(link)malloc(sizeof(node));head->next=ptr;ptr=head;}ptr=ptr->next;while(ptr!=NULL){ printf("The value is ==>%d\n",ptr->data);ptr=ptr->next;}}題目73:連接兩個鏈表。#include "stdlib.h"#include "stdio.h"struct list{ int data;struct list *next;};typedef struct list node;typedef node *link;link delete_node(link pointer,link tmp){if (tmp==NULL) /*delete first node*/return pointer->next;else{ if(tmp->next->next==NULL)/*delete last node*/tmp->next=NULL;else /*delete the other node*/tmp->next=tmp->next->next;return pointer;}}void selection_sort(link pointer,int num){ link tmp,btmp;int i,min;for(i=0;i<num;i++){tmp=pointer;min=tmp->data;btmp=NULL;while(tmp->next){ if(min>tmp->next->data){min=tmp->next->data;btmp=tmp;}tmp=tmp->next;}printf("\40: %d\n",min);pointer=delete_node(pointer,btmp);}}link create_list(int array[],int num){ link tmp1,tmp2,pointer;int i;pointer=(link)malloc(sizeof(node));pointer->data=array[0];tmp1=pointer;for(i=1;i<num;i++){ tmp2=(link)malloc(sizeof(node));tmp2->next=NULL;tmp2->data=array;tmp1->next=tmp2;tmp1=tmp1->next;}return pointer;}link concatenate(link pointer1,link pointer2){ link tmp;tmp=pointer1;while(tmp->next)tmp=tmp->next;tmp->next=pointer2;return pointer1;}void main(void){ int arr1[]={3,12,8,9,11};link ptr;ptr=create_list(arr1,5);selection_sort(ptr,5);}題目74:編寫一個函數,輸入n為偶數時,調用函數求1/2+1/4+...+1/n,當輸入n為奇數時,調用函數1/1+1/3+...+1/n(利用指針函數)main()#include "stdio.h"main(){float peven(),podd(),dcall();float sum;int n;while (1){scanf("%d",&n);if(n>1)break;}if(n%2==0){printf("Even=");sum=dcall(peven,n);}else{printf("Odd=");sum=dcall(podd,n);}printf("%f",sum);}float peven(int n){float s;int i;s=1;for(i=2;i<=n;i+=2)s+=1/(float)i;return(s);}float podd(n)int n;{float s;int i;s=0;for(i=1;i<=n;i+=2)s+=1/(float)i;return(s);}float dcall(fp,n)float (*fp)();int n;{float s;s=(*fp)(n);return(s);}題目75:填空練習(指向指針的指針)main(){ char *s[]={"man","woman","girl","boy","sister"};char **q;int k;for(k=0;k<5;k++){ ;/*這里填寫什么語句*/printf("%s\n",*q);}}題目76:找到年齡最大的人,并輸出。請找出程序中有什么問題。#define N 4#include "stdio.h"static struct man{ char name[20];int age;} person[N]={"li",18,"wang",19,"zhang",20,"sun",22};main(){struct man *q,*p;int i,m=0;p=person;for (i=0;i<N;i++){if(m<p->age)q=p++;m=q->age;}printf("%s,%d",(*q).name,(*q).age);}題目77:字符串排序。main(){char *str1[20],*str2[20],*str3[20];char swap();printf("please input three strings\n");scanf("%s",str1);scanf("%s",str2);scanf("%s",str3);if(strcmp(str1,str2)>0) swap(str1,str2);if(strcmp(str1,str3)>0) swap(str1,str3);if(strcmp(str2,str3)>0) swap(str2,str3);printf("after being sorted\n");printf("%s\n%s\n%s\n",str1,str2,str3);}char swap(p1,p2)char *p1,*p2;{char *p[20];strcpy(p,p1);strcpy(p1,p2);strcpy(p2,p);}題目78:海灘上有一堆桃子,五只猴子來分。第一只猴子把這堆桃子憑據分為五份,多了一個,這只猴子把多的一個扔入海中,拿走了一份。第二只猴子把剩下的桃子又平均分成五份,又多了一個,它同樣把多的一個扔入海中,拿走了一份,第三、第四、第五只猴子都是這樣做的,問海灘上原來最少有多少個桃子?main(){int i,m,j,k,count;for(i=4;i<10000;i+=4){ count=0;m=i;for(k=0;k<5;k++){j=i/4*5+1;i=j;if(j%4==0)count++;elsebreak;}i=m;if(count==4){printf("%d\n",count);break;}}}題目79:809*??=800*??+9*??+1 其中??代表的兩位數,8*??的結果為兩位數,9*??的結果為3位數。求??代表的兩位數,及809*??后的結果。output(long b,long i){ printf("\n%ld/%ld=809*%ld+%ld",b,i,i,b%i);}main(){long int a,b,i;a=809;for(i=10;i<100;i++){b=i*a+1;if(b>=1000&&b<=10000&&8*i<100&&9*i>=100)output(b,i); }}題目80:八進制轉換為十進制main(){ char *p,s[6];int n;p=s;gets(p);n=0;while(*(p)!='\0'){n=n*8+*p-'0';p++;}printf("%d",n);}題目81:求0—7所能組成的奇數個數。main(){long sum=4,s=4;int j;for(j=2;j<=8;j++)/*j is place of number*/{ printf("\n%ld",sum);if(j<=2)s*=7;elses*=8;sum+=s;}printf("\nsum=%ld",sum);}題目82:一個偶數總能表示為兩個素數之和。#include "stdio.h"#include "math.h"main(){ int a,b,c,d;scanf("%d",&a);for(b=3;b<=a/2;b+=2){ for(c=2;c<=sqrt(b);c++)if(b%c==0) break;if(c>sqrt(b))d=a-b;elsebreak;for(c=2;c<=sqrt(d);c++)if(d%c==0) break;if(c>sqrt(d))printf("%d=%d+%d\n",a,b,d);}}題目83:判斷一個素數能被幾個9整除main(){ long int m9=9,sum=9;int zi,n1=1,c9=1;scanf("%d",&zi);while(n1!=0){ if(!(sum%zi))n1=0;else{m9=m9*10;sum=sum+m9;c9++;}}printf("%ld,can be divided by %d \"9\"",sum,c9);}題目84:兩個字符串連接程序#include "stdio.h"main(){char a[]="acegikm";char b[]="bdfhjlnpq";char c[80],*p;int i=0,j=0,k=0;while(a!='\0'&&b[j]!='\0'){if (a<b[j]){ c[k]=a;i++;}elsec[k]=b[j++];k++;}c[k]='\0';if(a=='\0')p=b+j;elsep=a+i;strcat(c,p);puts(c);}題目85:回答結果(結構體變量傳遞)#include "stdio.h"struct student{ int x;char c;} a;main(){a.x=3;a.c='a';f(a);printf("%d,%c",a.x,a.c);}f(struct student b){b.x=20;b.c='y';}題目86:讀取7個數(1—50)的整數值,每讀取一個值,程序打印出該值個數的*。main(){int i,a,n=1;while(n<=7){ do {scanf("%d",&a);}while(a<1||a>50);for(i=1;i<=a;i++)printf("*");printf("\n");n++;}getch();}題目87:某個公司采用公用電話傳遞數據,數據是四位的整數,在傳遞過程中是加密的,加密規則如下:每位數字都加上5,然后用和除以10的余數代替該數字,再將第一位和第四位交換,第二位和第三位交換。main(){int a,i,aa[4],t;scanf("%d",&a);aa[0]=a%10;aa[1]=a%100/10;aa[2]=a%1000/100;aa[3]=a/1000;for(i=0;i<=3;i++){aa+=5;aa%=10;}for(i=0;i<=3/2;i++){t=aa;aa=aa[3-i];aa[3-i]=t;}for(i=3;i>=0;i--)printf("%d",aa);}題目88:專升本一題,讀結果。#include "stdio.h"#define M 5main(){int a[M]={1,2,3,4,5};int i,j,t;i=0;j=M-1;while(i<j){t=*(a+i);*(a+i)=*(a+j);*(a+j)=t;i++;j--;}for(i=0;i<m;i++)printf("%d",*(a+i));}題目89:時間函數舉例1#include "stdio.h"#include "time.h"void main(){ time_t lt; /*define a longint time varible*/lt=time(NULL);/*system time and date*/printf(ctime(<)); /*english format output*/printf(asctime(localtime(<)));/*tranfer to tm*/printf(asctime(gmtime(<))); /*tranfer to Greenwich time*/}題目90:時間函數舉例2#include "time.h"#include "stdio.h"main(){ time_t start,end;int i;start=time(NULL);for(i=0;i<3000;i++){ printf("\1\1\1\1\1\1\1\1\1\1\n");}end=time(NULL);printf("\1: The different is %6.3f\n",difftime(end,start));}題目91:時間函數舉例3#include "time.h"#include "stdio.h"main(){ clock_t start,end;int i;double var;start=clock();for(i=0;i<10000;i++){ printf("\1\1\1\1\1\1\1\1\1\1\n");}end=clock();printf("\1: The different is %6.3f\n",(double)(end-start));}題目92:時間函數舉例4,一個猜數游戲,判斷一個人反應快慢。(版主初學時編的)#include "time.h"#include "stdlib.h"#include "stdio.h"main(){char c;clock_t start,end;time_t a,b;double var;int i,guess;srand(time(NULL));printf("do you want to play it.('y' or 'n') \n");loop:while((c=getchar())=='y'){i=rand()%100;printf("\nplease input number you guess:\n");start=clock();a=time(NULL);scanf("%d",&guess);while(guess!=i){if(guess>i){printf("please input a little smaller.\n");scanf("%d",&guess);}else{printf("please input a little bigger.\n");scanf("%d",&guess);}}end=clock();b=time(NULL);printf("\1: It took you %6.3f seconds\n",var=(double)(end-start)/18.2);printf("\1: it took you %6.3f seconds\n\n",difftime(b,a));if(var<15)printf("\1\1 You are very clever! \1\1\n\n");else if(var<25)printf("\1\1 you are normal! \1\1\n\n");elseprintf("\1\1 you are stupid! \1\1\n\n");printf("\1\1 Congradulations \1\1\n\n");printf("The number you guess is %d",i);}printf("\ndo you want to try it again?(\"yy\".or.\"n\")\n");if((c=getch())=='y')goto loop;}題目93:家庭財務管理小程序/*money management system*/#include "stdio.h"#include "dos.h"main(){FILE *fp;struct date d;float sum,chm=0.0;int len,i,j=0;int c;char ch[4]="",ch1[16]="",chtime[12]="",chshop[16],chmoney[8];pp: clrscr();sum=0.0;gotoxy(1,1);printf("|---------------------------------------------------------------------------|");gotoxy(1,2);printf("| money management system(C1.0) 2000.03 |");gotoxy(1,3);printf("|---------------------------------------------------------------------------|");gotoxy(1,4);printf("| -- money records -- | -- today cost list -- |");gotoxy(1,5);printf("| ------------------------ |-------------------------------------|");gotoxy(1,6);printf("| date: -------------- | |");gotoxy(1,7);printf("| | | | |");gotoxy(1,8);printf("| -------------- | |");gotoxy(1,9);printf("| thgs: ------------------ | |");gotoxy(1,10);printf("| | | | |");gotoxy(1,11);printf("| ------------------ | |");gotoxy(1,12);printf("| cost: ---------- | |");gotoxy(1,13);printf("| | | | |");gotoxy(1,14);printf("| ---------- | |");gotoxy(1,15);printf("| | |");gotoxy(1,16);printf("| | |");gotoxy(1,17);printf("| | |");gotoxy(1,18);printf("| | |");gotoxy(1,19);printf("| | |");gotoxy(1,20);printf("| | |");gotoxy(1,21);printf("| | |");gotoxy(1,22);printf("| | |");gotoxy(1,23);printf("|---------------------------------------------------------------------------|");i=0;getdate(&d);sprintf(chtime,"%4d.%02d.%02d",d.da_year,d.da_mon,d.da_day);for(;;){gotoxy(3,24);printf(" Tab __browse cost list Esc __quit");gotoxy(13,10);printf(" ");gotoxy(13,13);printf(" ");gotoxy(13,7);printf("%s",chtime);j=18;ch[0]=getch();if(ch[0]==27)break;strcpy(chshop,"");strcpy(chmoney,"");if(ch[0]==9){mm:i=0;fp=fopen("home.dat","r+");gotoxy(3,24);printf(" ");gotoxy(6,4);printf(" list records ");gotoxy(1,5);printf("|-------------------------------------|");gotoxy(41,4);printf(" ");gotoxy(41,5);printf(" |");while(fscanf(fp,"%10s%14s%f\n",chtime,chshop,&chm)!=EOF){ if(i==36){ getch();i=0;}if ((i%36)<17){ gotoxy(4,6+i);printf(" ");gotoxy(4,6+i);}elseif((i%36)>16){ gotoxy(41,4+i-17);printf(" ");gotoxy(42,4+i-17);}i++;sum=sum+chm;printf("%10s %-14s %6.1f\n",chtime,chshop,chm);}gotoxy(1,23);printf("|---------------------------------------------------------------------------|");gotoxy(1,24);printf("| |");gotoxy(1,25);printf("|---------------------------------------------------------------------------|");gotoxy(10,24);printf("total is %8.1f$",sum);fclose(fp);gotoxy(49,24);printf("press any key to.....");getch();goto pp;}else{while(ch[0]!='\r'){ if(j<10){ strncat(chtime,ch,1);j++;}if(ch[0]==8){len=strlen(chtime)-1;if(j>15){ len=len+1; j=11;}strcpy(ch1,"");j=j-2;strncat(ch1,chtime,len);strcpy(chtime,"");strncat(chtime,ch1,len-1);gotoxy(13,7);printf(" ");}gotoxy(13,7);printf("%s",chtime);ch[0]=getch();if(ch[0]==9)goto mm;if(ch[0]==27)exit(1);}gotoxy(3,24);printf(" ");gotoxy(13,10);j=0;ch[0]=getch();while(ch[0]!='\r'){ if (j<14){ strncat(chshop,ch,1);j++;}if(ch[0]==8){ len=strlen(chshop)-1;strcpy(ch1,"");j=j-2;strncat(ch1,chshop,len);strcpy(chshop,"");strncat(chshop,ch1,len-1);gotoxy(13,10);printf(" ");}gotoxy(13,10);printf("%s",chshop);ch[0]=getch();}gotoxy(13,13);j=0;ch[0]=getch();while(ch[0]!='\r'){ if (j<6){ strncat(chmoney,ch,1);j++;}if(ch[0]==8){ len=strlen(chmoney)-1;strcpy(ch1,"");j=j-2;strncat(ch1,chmoney,len);strcpy(chmoney,"");strncat(chmoney,ch1,len-1);gotoxy(13,13);printf(" ");}gotoxy(13,13);printf("%s",chmoney);ch[0]=getch();}if((strlen(chshop)==0)||(strlen(chmoney)==0))continue;if((fp=fopen("home.dat","a+"))!=NULL);fprintf(fp,"%10s%14s%6s",chtime,chshop,chmoney);fputc('\n',fp);fclose(fp);i++;gotoxy(41,5+i);printf("%10s %-14s %-6s",chtime,chshop,chmoney);}}} 題目94:計算字符串中子串出現的次數#include "string.h"#include "stdio.h"main(){ char str1[20],str2[20],*p1,*p2;int sum=0;printf("please input two strings\n");scanf("%s%s",str1,str2);p1=str1;p2=str2;while(*p1!='\0'){if(*p1==*p2){while(*p1==*p2&&*p2!='\0'){p1++;p2++;}}elsep1++;if(*p2=='\0')sum++;p2=str2;}printf("%d",sum);getch();} 題目95:從鍵盤輸入一些字符,逐個把它們送到磁盤上去,直到輸入一個#為止。#include "stdio.h"main(){ FILE *fp;char ch,filename[10];scanf("%s",filename);if((fp=fopen(filename,"w"))==NULL){printf("cannot open file\n");exit(0);}ch=getchar();ch=getchar();while(ch!='#'){fputc(ch,fp);putchar(ch);ch=getchar();}fclose(fp);}題目96:從鍵盤輸入一個字符串,將小寫字母全部轉換成大寫字母,然后輸出到一個磁盤文件“test”中保存。輸入的字符串以!結束。 #include "stdio.h"main(){FILE *fp;char str[100],filename[10];int i=0;if((fp=fopen("test","w"))==NULL){ printf("cannot open the file\n");exit(0);}printf("please input a string:\n");gets(str);while(str!='!'){ if(str>='a'&&str<='z')str=str-32;fputc(str,fp);i++;}fclose(fp);fp=fopen("test","r");fgets(str,strlen(str)+1,fp);printf("%s\n",str);fclose(fp);}題目97:有兩個磁盤文件A和B,各存放一行字母,要求把這兩個文件中的信息合并(按字母順序排列), 輸出到一個新文件C中。#include "stdio.h"main(){ FILE *fp;int i,j,n,ni;char c[160],t,ch;if((fp=fopen("A","r"))==NULL){printf("file A cannot be opened\n");exit(0);}printf("\n A contents are :\n");for(i=0;(ch=fgetc(fp))!=EOF;i++){c=ch;putchar(c);}fclose(fp);ni=i;if((fp=fopen("B","r"))==NULL){printf("file B cannot be opened\n");exit(0);}printf("\n B contents are :\n");for(i=0;(ch=fgetc(fp))!=EOF;i++){c=ch;putchar(c);}fclose(fp);n=i;for(i=0;i<n;i++)for(j=i+1;j<n;j++)if(c>c[j]){t=c;c=c[j];c[j]=t;}printf("\n C file is:\n");fp=fopen("C","w");for(i=0;i<n;i++){ putc(c,fp);putchar(c);}fclose(fp);}題目98:有五個學生,每個學生有3門課的成績,從鍵盤輸入以上數據(包括學生號,姓名,三門課成績),計算出平均成績,況原有的數據和計算出的平均分數存放在磁盤文件"stud"中。#include "stdio.h"struct student{ char num[6];char name[8];int score[3];float avr;} stu[5];main(){int i,j,sum;FILE *fp;/*input*/for(i=0;i<5;i++){ printf("\n please input No. %d score:\n",i);printf("stuNo:");scanf("%s",stu.num);printf("name:");scanf("%s",stu.name);sum=0;for(j=0;j<3;j++){ printf("score %d.",j+1);scanf("%d",&stu.score[j]);sum+=stu.score[j];}stu.avr=sum/3.0;}fp=fopen("stud","w");for(i=0;i<5;i++)if(fwrite(&stu,sizeof(struct student),1,fp)!=1)printf("file write error\n");fclose(fp);} -回復 引用 TOP 返回列表 技術面試Globalcoogle. |聯系我們 |論壇統計|Archiver|WAP
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