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[10];  //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[10];
   int i=0;
   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() != '
')
         continue;
  
      student++;
      i++;
      if(i<max)
        puts("next name");
   }

}

void output(STU * student)
{
   int i=0;
   while(i<max)
   {
      printf("%d---%s---%d---%d
",i,student->name,student->age,student->score);
      i++;
      student++;
   }

}

void write(STU * student)
{
    FILE *fp;
    int i=0;
    if( (fp=fopen("data.txt","w+b")) == NULL )
    {
      puts("open error");
    }
   
    while(i<max)
    {
       fwrite(student,size,1,fp);
       i++;student++;
    }
 
   fclose(fp);

}

void clean(STU * student)
{
  int i=0;
  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[10];
   int age;
   int score;
}STU;
int size = sizeof(STU);
void read(STU *);

void main(void)
{
   STU kang[max];
   read(kang); 
   
   int i=0;
   while(i<max)
   {
     printf("%s---%d---%d
",kang[i].name,kang[i].age,kang[i].score);
     i++;
   }   

}


void read(STU * student)
{
    FILE *fp;
    int i=0;
    if( (fp=fopen("data.txt","a+b")) == NULL )
    {
      puts("open error");
      exit(1);
    }
    rewind(fp);
   while(i<max)
   {  
     fread(student,size,1,fp);
     student++;i++;
   }   
 
   fclose(fp);

}