早年作品，不是今天發(fā)現(xiàn)，恐怕要永遠(yuǎn)丟了。
解方程的種類包括：

多元一次
1.1 二元一次
1.2 三元一次
1.3 四元一次

一元二次

一元高次

進(jìn)制轉(zhuǎn)換

轉(zhuǎn)載請注明出處，聯(lián)系我: t39q@163.com
本人熱衷于數(shù)據(jù)庫技術(shù)及算法的研究，志同道合之士， 歡迎探討

#include<stdio.h> #include<math.h> main() { code_fun(); }code_fun() {long int code=123,accept_code,j; for(j=0;j<3;j++){printf("Qing shu ru mi ma:");scanf("%ld",&accept_code);if(j<2){if(code==accept_code){clrscr();menu();break;}else{clrscr();printf("Mi ma cuo wu!Ni hai you %d ji hui.\n\n",2-j);}}else{printf("\nDui bu qi,Ni yi jing shu ru cuo wu 3 ci,An ren yi jian tui chu.\n");getch();tui_chu();}} }tui_chu() { }menu() { int variable_1; printf("\n\n\n\n\n\n\n 1: Duo yuan yi ci fang cheng zu.\n"); printf(" 2: Yi yuan er ci fang cheng.\n"); printf(" 3: Yi yuan gao ci fang cheng.\n"); printf(" 4: Jin zhi zhuan huan.\n"); printf(" 5: Lian xi wo.\n"); printf(" 6: Tui chu.\n"); printf(" Qing shu ru:"); scanf("%d",&variable_1);if(variable_1>0&&variable_1<7){switch(variable_1){case 1:duo_yuan_yi_ci();break;case 2:yi_yuan_er_ci();break;case 3:yi_yuan_gao_ci();break;case 4:jin_zhi_zhuan_huan();break;case 5:contact_me();break;case 6:break;}}else{clrscr();printf("Shu ru cuo wu,Qing chong xin shu ru.");menu();}}duo_yuan_yi_ci()/*屬于menu()*/{int variable_2;clrscr();printf("\n\n\n\n\n\n\n 1: Er yuan yi ci.\n");printf(" 2: San yuan yi ci.\n");printf(" 3: Si yuan yi ci.\n");printf(" 4: Hui zhu cai dan.\n");printf(" Qing shu ru:");scanf("%d",&variable_2);switch(variable_2){case 1:er_yuan_yi_ci();break;case 2:san_yuan_yi_ci();break;case 3:si_yuan_yi_ci();break;case 4:{clrscr();menu();}}}er_yuan_yi_ci()/*屬于duo_yuan_yi_ci()*/{float a1,b1,c1,a2,b2,c2;clrscr();printf("Fang cheng mo shi wei: a1*x+b1*y=c1\n");printf(" a2*x+b2*y=c2\n");printf("\n\nQing shu ru a1:");scanf("%f",&a1);printf("Qing shu ru b1:");scanf("%f",&b1);printf("Qing shu ru c1:");scanf("%f",&c1);printf("\n");printf("Qing shu ru a2:");scanf("%f",&a2);printf("Qing shu ru b2:");scanf("%f",&b2);printf("Qing shu ru c2:");scanf("%f",&c2);if(a1/a2!=b1/b2){printf("\n");printf("x=%f\n",-((b1*c2-b2*c1)/(a1*b2-a2*b1)));printf("y=%f\n",(a1*c2-a2*c1)/(a1*b2-a2*b1));}else{printf("\n");printf("a1/a2=b1/b2,fang cheng wu li.");}printf("\n");printf("Fang cheng wu li,An ren yi jian hui zhu cai dan.");getch();clrscr();menu();}san_yuan_yi_ci()/*屬于duo_yuan_yi_ci()*/{float a1,b1,c1,d1, a2,b2,c2,d2, a3,b3,c3,d3, x,y,z;clrscr();/*標(biāo)注模式*/printf("Fang cheng mo shi wei:a1*x+b1*y+c1*z=d1\n");printf(" a2*x+b2*y+c2*z=d2\n");printf(" a3*x+b3*y+c3*z=d3\n");printf("Qing shu ru a1:");scanf("%f",&a1);printf("Qing shu ru b1:");scanf("%f",&b1);printf("Qing shu ru c1:");scanf("%f",&c1);printf("Qing shu ru d1:");scanf("%f",&d1);printf("\n");printf("Qing shu ru a2:");scanf("%f",&a2);printf("Qing shu ru b2:");scanf("%f",&b2);printf("Qing shu ru c2:");scanf("%f",&c2);printf("Qing shu ru d2:");scanf("%f",&d2);printf("\n");printf("Qing shu ru a3:");scanf("%f",&a3);printf("Qing shu ru b3:");scanf("%f",&b3);printf("Qing shu ru c3:");scanf("%f",&c3);printf("Qing shu ru d3:");scanf("%f",&d3);printf("\n");y=((d1*a2-d2*a1)*(c3*a2-c2*a3)-(d3*a2-d2*a3)*(c1*a2-c2*a1))/((b1*a2-b2*a1)*(c3*a2-c2*a3)-(b3*a2-b2*a3)*(c1*a2-c2*a1));z=((d1*a2-d2*a1)*(b2*a3-b3*a2)-(d2*a3-d3*a2)*(b1*a2-b2*a1))/((c1*a2-c2*a1)*(b2*a3-b3*a2)-(c2*a3-c3*a2)*(b1*a2-b2*a1));x=(d1-c1*z-b1*y)/a1;printf("x=%f\n",x);printf("y=%f\n",y);printf("z=%f\n",z);printf("An ren yi jian hui zhu cai dan.");getch();clrscr();menu();}si_yuan_yi_ci()/*屬于duo_yuan_yi_ci()*/{float a1=1,b1=1,c1=1,d1=1,e1=10, a2=1,b2=2,c2=1,d2=1,e2=12, a3=1,b3=1,c3=2,d3=1,e3=13, a4=1,b4=1,c4=1,d4=2,e4=14, x,y,z,w, jian_ce_1,jian_ce_2;jian_ce_1=(((e1*d2-e2*d1)*(a2*d3-a3*d2)-(e2*d3-e3*d2)*(a1*d2-a2*d1))*((b2*d3-b3*d2)*(a3*d4-a4*d3)-(b3*d4-b4*d3)*(a2*d3-a3*d2))-((e2*d3-e3*d2)*(a3*d4-a4*d3)-(e3*d4-e4*d3)*(a2*d3-a3*d2))*((b1*d2-b2*d1)*(a2*d3-a3*d2)-(b2*d3-b3*d2)*(a1*d2-a2*d1)));jian_ce_2=(((c1*d2-c2*d1)*(a2*d3-a3*d2)-(c2*d3-c3*d2)*(a1*d2-a2*d1))*((b2*d3-b3*d2)*(a3*d4-a4*d3)-(b3*d4-b4*d3)*(a2*d3-a3*d2))-((c2*d3-c3*d2)*(a3*d4-a4*d3)-(c3*d4-c4*d3)*(a2*d3-a3*d2))*((b1*d2-b2*d1)*(a2*d3-a3*d2)-(b2*d3-b3*d2)*(a1*d2-a2*d1)));printf("%f,%f",jian_ce_1,jian_ce_2);getch();z=(((e1*d2-e2*d1)*(a2*d3-a3*d2)-(e2*d3-e3*d2)*(a1*d2-a2*d1))*((b2*d3-b3*d2)*(a3*d4-a4*d3)-(b3*d4-b4*d3)*(a2*d3-a3*d2))-((e2*d3-e3*d2)*(a3*d4-a4*d3)-(e3*d4-e4*d3)*(a2*d3-a3*d2))*((b1*d2-b2*d1)*(a2*d3-a3*d2)-(b2*d3-b3*d2)*(a1*d2-a2*d1)))/(((c1*d2-c2*d1)*(a2*d3-a3*d2)-(c2*d3-c3*d2)*(a1*d2-a2*d1))*((b2*d3-b3*d2)*(a3*d4-a4*d3)-(b3*d4-b4*d3)*(a2*d3-a3*d2))-((c2*d3-c3*d2)*(a3*d4-a4*d3)-(c3*d4-c4*d3)*(a2*d3-a3*d2))*((b1*d2-b2*d1)*(a2*d3-a3*d2)-(b2*d3-b3*d2)*(a1*d2-a2*d1)));printf("%f",z);getch();}yi_yuan_er_ci()/*屬于menu*/ { float a,b,c,d,x1,x2;/*d設(shè)計(jì)為判別式*/ clrscr(); printf("Fang cheng mo shi wei: a*x*x+b*x+c=0\n"); printf("\n\nQing shu ru a:"); scanf("%f",&a); printf("Qing shu ru b:"); scanf("%f",&b); printf("Qing shu ru c:"); scanf("%f",&c); d=b*b-4*a*c; printf("\n"); printf("\nfen xi jie guo wei:"); if(d==0)/*注意：C里面的等號為“==”*/{printf("\n\nx1=x2=%f\n",(-b)/(2*a));printf("zhong zhou wei: x=%f\n",(-b)/(2*a)); printf("ding dian wei:(%f,%f)\n",(-b)/(2*a),(4*a*c-b*b)/(4*a));} else if(d>0){printf("\n\nx1=%f\nx2=%f\n",((-b)+sqrt(d))/(2*a),((-b)-sqrt(d))/(2*a));printf("zhong zhou wei: x=%f\n",(-b)/(2*a));printf("ding dian wei:(%f,%f)\n",(-b)/(2*a),(4*a*c-b*b)/(4*a));} else{printf("\n\nfang cheng wu shi gen.\n");printf("zhong zhou wei: x=%f\n",(-b)/(2*a));printf("ding dian wei:(%f, %f)\n",(-b)/(2*a),(4*a*c-b*b)/(4*a));}printf("Press any key to back menu."); getch(); clrscr(); menu(); }yi_yuan_gao_ci(){int veriable_9;clrscr();printf("\n\n\n\n\n\n\n");printf(" 1.yi yuan san ci.\n");printf(" 2.yi yuan si ci.\n");printf(" 3.Back menu.\n");printf(" Qing shu ru:");scanf("%d",&veriable_9);if(veriable_9>0&&veriable_9<4){switch(veriable_9){case 1:yi_yuan_san_ci();break;case 2:yi_yuan_si_ci();break;case 3:{clrscr();menu();}break;}}else{printf("shu ru cuo wu,an ren yi jian chong xin xuan ze.");getch();clrscr();yi_yuan_gao_ci();}}float f(float a9,float b9,float c9,float d9, float x)/*屬于yi_yuan_gao_ci()*/{float y;y=a9*x*x*x+b9*x*x+c9*x+d9;return(y);}yi_yuan_san_ci()/*屬于menu()*/{float x1,x2,x3,a8,b8,c8,d8;clrscr();printf("fang cheng mo shi wei:a*x*x*x+b*x*x+c*x+d=0\n");printf("qing shu ru a: ");scanf("%f",&a8);printf("qing shu ru b: ");scanf("%f",&b8);printf("qing shu ru c: ");scanf("%f",&c8);printf("qing shu ru d: ");scanf("%f",&d8);printf("Please input an area that include one root(like 1,2):");scanf("%f,%f",&x1,&x2);if(f(a8,b8,c8,d8,x1)*f(a8,b8,c8,d8,x2)>0){printf("yi xia shi bu neng dei dao gen de san zhong ke neng de qing kuang:\n");printf("1.shu ru de qu jian bu bao han gen.\n");printf("2.shu ru de qu jian bao han liang ge yi shang de gen.\n");printf("3.zai shu ru de qu jian shang qu xian yu x zhou xiang qie.\n");printf("Press any key to input again.");getch();yi_yuan_gao_ci();}else{do{x3=(x1+x2)/2;if(f(a8,b8,c8,d8,x3)*f(a8,b8,c8,d8,x1)>0)x1=x3;elsex2=x3;}while(fabs(f(a8,b8,c8,d8,x3))>=0.000001);/*注意寫頭文件“#include<math.h>”*/printf("yi ge gen shi: %f",x3);printf("\n");printf("An ren yi jian hui zhu cai dan.");getch();clrscr();menu();}}float f1(float a,float b,float c,float d,float e, float x)/*屬于yi_yuan_gao_ci()*/{float y;y=a*x*x*x*x+b*x*x*x+c*x*x+d*x+e;return(y);}yi_yuan_si_ci()/*屬于menu()*/{float x1,x2,x3,a,b,c,d,e;clrscr();printf("fang cheng mo shi wei:a*x*x*x*x+b*x*x*x+c*x*x+d*x+e=0\n");printf("qing shu ru a: ");scanf("%f",&a);printf("qing shu ru b: ");scanf("%f",&b);printf("qing shu ru c: ");scanf("%f",&c);printf("qing shu ru d: ");scanf("%f",&d);printf("qing shu ru e: ");scanf("%f",&e);printf("Please input an area that include one root(like 1,2):");scanf("%f,%f",&x1,&x2);if(f1(a,b,c,d,e,x1)*f1(a,b,c,d,e,x2)>0){printf("yi xia shi bu neng dei dao gen de san zhong ke neng de qing kuang:\n");printf("1.shu ru de qu jian bu bao han gen.\n");printf("2.shu ru de qu jian bao han liang ge yi shang de gen.\n");printf("3.zai shu ru de qu jian shang qu xian yu x zhou xiang qie.\n");printf("Press any key to input again.");getch();yi_yuan_gao_ci();}else{do{x3=(x1+x2)/2;if(f1(a,b,c,d,e,x3)*f1(a,b,c,d,e,x1)>0)x1=x3;elsex2=x3;}while(fabs(f1(a,b,c,d,e,x3))>=0.0000001);/*注意寫頭文件“#include<math.h>”*/printf("one root is %f",x3);printf("\n");printf("Press any key to back menu.");getch();clrscr();menu();}}/*任意進(jìn)制到十進(jìn)制*/ unsigned long fun1() { unsigned long s=0;/*yjz=yuan jin zhi的首字母,即是原來的數(shù)是多少進(jìn)制*/ int i,yjz,veriable_3,a[8]; printf("Qing shu ru yao zhuan huan de shu de jin zhi:\n"); scanf("%d",&yjz);/*注意地址引用符&*/ if(yjz>1&&yjz<11) { printf("Qing shu ru ni de shu ju de 8 wei xing shi\n"); for(i=0;i<=7;i++){printf("di %d wei: ",8-i);scanf("%d",&a[i]);} for(i=0;i<=7;i++)s=s+a[i]*(unsigned long)pow(yjz,7-i); return(s); } else { printf("Bao qian,zhi neng zai 2-10 jin zhi zhi jian jin xing zhuan huan.\n\n"); printf("Press any key to continue."); getch(); clrscr(); fun1(); } } /*十進(jìn)制到任意進(jìn)制*/ void fun2(unsigned long m) {int i,ys[8],hjz;/*ys=yu shu,hjz=hou mian de jin zhi*/ printf("qing shu ru yao dei dao de jin zhi:\n"); scanf("%d",&hjz); for(i=0;i<=7;i++){ys[i]=m%hjz;m=m/hjz;} for (i=7;i>=0;i--)printf("%2d",ys[i]); }/*子主函數(shù)*/ jin_zhi_zhuan_huan()/*僅限于正數(shù)*/ {unsigned long sj;/*sj=shi jin zhi*/ clrscr(); sj=fun1(); printf("shi jin zhi wei:%ld\n",sj); fun2(sj); printf("\nPress any key to back menu."); getch(); clrscr(); menu(); }contact_me() { clrscr(); printf("E-mail:t39q@163.com\n"); printf("\n"); printf(" QQ:407-959-978\n"); printf("\n"); printf("An ren yi jian hui zhu cai dan."); getch(); clrscr(); menu(); }

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