从文件中读取结构体中变量值不正确(每次都是固定值)!

[shuirh]

#include <stdio.h>

struct person
{
char name[20];
int phonenumber;
};

main()
{
FILE *fp = NULL;
struct person buffer[100];

printf( "please input the name and phonenumber:" );
scanf( "%s%d", buffer[0].name, &buffer[0].phonenumber );

fp = fopen( "backup.txt", "wb" );

fwrite( &buffer[0], sizeof ( struct person ), 1, fp);
close( fp );

fp = fopen( "backup.txt", "rb");
fread( &buffer[0], sizeof ( struct person ), 1, fp);
printf("%s,%d\n", buffer[0].name, &buffer[0].phonenumber);
close( fp );
}

phonenumber这个变量无论你输入的值是多少,输出都是1242672,这是什么怪事???
如何修改???

[shuirh]

我从头跟踪到尾,都正确,就是输出的时候成了1242672,真是没见过.

[shuirh]

出鬼了,我把int phonenumber;改成int phonenumber[10];就正确了,这是为虾米啊????

[xxweilw]

printf("%s,%d\n", buffer[0].name, &buffer[0].phonenumber); 多了一个&符号，难怪每次都是一样

[yanxiaotao]

考，这错误你都能犯！

[Dinelgua]

打印的是地址

不过 也不怪楼主 printf 与 scanf的参数形式不一致性 也确实一大弊病

[waizqfor]

#include <stdio.h> 

struct person 
{ 
char name[20]; 
int phonenumber; 
}; 

main() 
{ 
FILE *fp = NULL; 
struct person buffer[100]; 

printf( "please input the name and phonenumber:" ); 
scanf( "%s%d", buffer[0].name, &buffer[0].phonenumber ); 

fp = fopen( "backup.txt", "wb" ); 

fwrite( &buffer[0], sizeof ( struct person ), 1, fp); 
close( fp ); 

fp = fopen( "backup.txt", "rb"); 
fread( &buffer[0], sizeof ( struct person ), 1, fp); 
printf("%s,%d\n", buffer[0].name, buffer[0].phonenumber); //printf和scanf形式不同
fclose( fp ); //注意关闭文件的函数写法
}