#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<conio.h>
#include <ctype.h>
void main()
{
    int l;
    int num1=0,num2;
    FILE*fp2;
    if((fp2=fopen("E:\\52.txt","a+"))==NULL){
        printf("Cannot open file strike any key exit!");
        exit(0);
    }
    rewind(fp2);
    fscanf(fp2,"%d",&num1);
    num2=fscanf(fp2,"%d",&num1);
    printf("%d",num2);
    if(num1==0){
        printf("没有记录，请按1\n");
        scanf("%d",&num1);
        fprintf(fp2,"%d",num1);
        fscanf(fp2,"%d",&num1);
        printf("你的编号是:%d\n",num1);
    }
    else{
        printf("danqiang:\n",num1);
        printf("+1:");
        scanf("%d",&num1);
        fprintf(fp2,"%d",num1);
        printf("你的编号是:%d\n",num1);
    }
    fclose(fp2);
}
为什么fscanf()返回值为0？？哪里错了？？望高手指点

假设文件内容只有一个数的话：
rewind(fp2);
fscanf(fp2,"%d",&num1);//这句读完了
num2=fscanf(fp2,"%d",&num1);//这句读取失败，也就是说没读入信息，所以返回0
printf("%d",num2);//所以num2就是0了
重读就好了，调过来。

...
    fscanf(fp2,"%d",&num1);
    rewind(fp2);
    num2=fscanf(fp2,"%d",&num1);
    printf("%d",num2);
...