C语言 文件板块内容编程

Question

程序可以运行，可以在磁盘中存入内容，但是存入磁盘中的内容与我输入的内容不太一样。为什么？

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
struct student
{
    char name[10];
    int number;
    int age;
    char address[20];
}a[3];
int main()
{
    int i=0;
    FILE *fp;

    for(i=0;i<3;i++)
        scanf( "%s%d%d%s",a[i].name, &a[i].number, &a[i].age, a[i].address );
    
    if( ( fp = fopen ( "d:\\a.txt" , "w" ) ) == NULL)
    {
        printf("打开文件失败\n");
        exit(1);
    }
    fwrite( a, sizeof( struct student ), 3, fp );
    fclose( fp );
    return 0;
}

Answer 1

修改如下，供参考：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
struct student
{
    char name[10];
    int number;
    int age;
    char address[20];
}a[3];
int main()
{
    int i = 0;
    FILE* fp;

    for (i = 0; i < 3; i++)
        scanf("%s%d%d%s", a[i].name, &a[i].number, &a[i].age, a[i].address);

    if ((fp = fopen("d:\\a.txt", "w")) == NULL)
    {
        printf("打开文件失败\n");
        exit(1);
    }
    //fwrite(a, sizeof(struct student), 3, fp);
    for (i = 0; i < 3; i++)
        fprintf(fp, "%s %d %d %s\n", a[i].name, a[i].number, a[i].age, a[i].address);
    fclose(fp);
    return 0;
}