c 结构体读取与保存

1.结构体保存到文本

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #define max 3

 typedef struct student{
    char name[];  //最好用数组，方便，用指针到时写入到文本不好操作
    int age;
    int score;
 }STU;
 int size = sizeof(STU);
 void write(STU *);
 void input(STU *);
 void output(STU *);
 //void clean(STU *); 

 void main(void)
 {
   STU kang[max];
   input(kang);
   output(kang);
   write(kang);
   clean(kang);
 }

 void input(STU * student)
 {
    char temp[];
    int i=;
    while(i<max && fgets(temp,sizeof(temp),stdin)!=NULL && temp[]!='\0'  )
    {
       //student->name = (char *) malloc(strlen(temp)+1);
       strcpy(student->name,temp);
       puts("age ?");
       scanf("%d",&student->age);
       puts("score ?");
       scanf("%d",&student->score);

       while(getchar() != '\n')
          continue;

       student++;
       i++;
       if(i<max)
         puts("next name");
    }

 }

 void output(STU * student)
 {
    int i=;
    while(i<max)
    {
       printf("%d---%s---%d---%d\n",i,student->name,student->age,student->score);
       i++;
       student++;
    }

 }

 void write(STU * student)
 {
     FILE *fp;
     int i=;
     if( (fp=fopen("data.txt","w+b")) == NULL )
     {
       puts("open error");
     }

     while(i<max)
     {
        fwrite(student,size,,fp);
        i++;student++;
     }

    fclose(fp);

 }

 void clean(STU * student)
 {
   int i=;
   while(i<max)
   {
     free(student->name);
     i++;
     student++;
   }
 }

2.读取结构体

 #include <stdio.h>
 #include <stdlib.h>
 #define max 3

 typedef struct student{
    char name[];
    int age;
    int score;
 }STU;
 int size = sizeof(STU);
 void read(STU *);

 void main(void)
 {
    STU kang[max];
    read(kang); 

    int i=;
    while(i<max)
    {
      printf("%s---%d---%d\n",kang[i].name,kang[i].age,kang[i].score);
      i++;
    }   

 }

 void read(STU * student)
 {
     FILE *fp;
     int i=;
     if( (fp=fopen("data.txt","a+b")) == NULL )
     {
       puts("open error");
       exit();
     }
     rewind(fp);
    while(i<max)
    {
      fread(student,size,,fp);
      student++;i++;
    }   

    fclose(fp);

 }