#include<stdio.h>
#include<stdlib.h>
#include<fcntl.h>
#define SIZE 3
struct student
{
long num;
char name[10];
int age;
char address[10];
}stu[SIZE],out;
void fsave()
{
FILE*fp;
int i;
if((fp=fopen("student","wb"))==NULL)
{
printf("Cannot open file.\n");
exit(1);
}
for(i=0;i<SIZE;i++)
if(fwrite(&stu[i],sizeof(struct student),1,fp)!=1)
printf("File write error.\n");
fclose(fp);
}
main()
{
FILE *fp;int i;
printf("please enter student's number,name,age and address.\n");
for(i=0;i<SIZE;i++)
{
printf("Input student %d:",i+1);
scanf("%d%s%d%s",&stu[i].num,stu[i].name,&stu[i].age,stu[i].address);
}
fsave();
return 0;
}
修改，供参考：
#include<stdio.h>
#include<stdlib.h>
#include<fcntl.h>
#define SIZE 3
struct student{
int num;
char name[16];
int age;
char address[32];
}stu[SIZE],out;
void fsave()
{
FILE*fp;
int i;
if((fp=fopen("student","wb"))==NULL)
{
printf("Cannot open file.\n");
exit(1);
}
for(i=0;i<SIZE;i++)
{
fprintf(fp,"%d %s %d %s\n",stu[i].num,stu[i].name,stu[i].age,stu[i].address);//格式化输入
//if(fwrite(&stu[i],sizeof(struct student),1,fp)!=1)
//{
// printf("File write error.\n");
//}
}
fclose(fp);
}
int main()
{
//FILE *fp;
int i;
printf("please enter student's number,name,age and address.\n");
for(i=0;i<SIZE;i++)
{
printf("Input student %d:",i+1);
scanf("%d%s%d%s",&stu[i].num,stu[i].name,&stu[i].age,stu[i].address);
}
fsave();
return 0;
}