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#include

#include

#define?filename?"sss.dat"

typedef?struct

{

int?no;

char?*name;

int?math;

}info;

typedef?struct

{

info?*link;

int?length;

int?maxsize;

}head;

void?init(head*);

void?menu(head*);

void?listInfo(head?*head);

void?add(head?*head,info?in);

void?addinfo(head?*head);

void?main()

{

head?head;

head.length=0;

head.maxsize=0;

init(&head);

menu(&head);

}

void?init(head?*in)

{

FILE?*fp;

info?val;

fp=fopen(filename,"rt");

if(fp==NULL)

{

printf("文件讀取失敗！");

fp=fopen(filename,"at");

if(fp==NULL)

{

printf("文件創建失敗！\n");

}

fclose(fp);

}

fp=fopen(filename,"rt");

rewind(fp);

while(feof(fp)!=?0){

//val=(info)malloc(sizeof(info));

fread(&val,sizeof(info),1,fp);

if(&val)

add(in,val);

else{

printf("error");

}

}

fclose(fp);

}

void?write(head?*in)

{

FILE?*fp;

int?i;

info?temp;

fp=fopen(filename,"at");

if(fp==NULL)

{

printf("文件創建失敗！");

}

rewind(fp);

for(i=0;ilength);i++){

temp=in->link[i];

fwrite(&temp,sizeof(info),1,fp);

//printf("%d",i);

}

fclose(fp);

menu(in);

}

void?add(head?*head,info?in)

{

if(head->length==head->maxsize){

head->link=(info?*)malloc((head->maxsize+10)*sizeof(info));

head->maxsize+=10;

}

head->link[head->length]=in;

head->length++;

}

void?menu(head?*head)

{

int?op;

printf("\t\t*********************************\n");

printf("\t\t*??????學生信息管理系統\t\t*\n");

printf("\t\t*\t\t\t\t*\n");

printf("\t\t*??1.添加學生信息\t\t*\n");

printf("\t\t*??2.查看學生信息\t\t*\n");

printf("\t\t*??7.保存信息\t\t\t*\n");

printf("\t\t*??8.退出\t\t\t*\n");

printf("\t\t*********************************\n");

scanf("%d",&op);

getchar();

switch(op){

case?1:

{

addinfo(head);

break;

}

case?2:

{

listInfo(head);

break;

}

case?7:

{

write(head);

break;

}

case?8:

{

exit(0);

break;

}

default:

{

menu(head);

break;

}

}

}

void?addinfo(head?*head)

{char?*name=(char?*)malloc(sizeof(char));

info?*in=(info?*)malloc(sizeof(info));

printf("請輸入學號：");

scanf("%d",&(in->no));

printf("請輸入姓名：");

scanf("%s",name);

in->name=name;

printf("請輸入分數：");

scanf("%d",&(in->math));

add(head,*in);

menu(head);

}

void?listInfo(head?*head)

{

int?i=0;

for(;ilength;i++){

printf("\t%d\n",head->link[i].no);

}

menu(head);

}

為什么調用init方法后head的link還是空啊

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