为什么这个程序运行时候这两个函数，我觉得读取函数总是出错。显示信息为：
int save()
{
    int i;

    FILE *fp;
    if((fp=fopen("D:\\people_dat","ab+"))==NULL)
    {
        printf("cannot open file\n");
        exit(1);
    }
    else
    {

    for(i=0;i<m;i++)
        fprintf(fp,"%s",peo[m].name);
        fprintf(fp,"%d",peo[m].year);
        fprintf(fp,"%d",peo[m].month);
        fprintf(fp,"%d",peo[m].in);
        fprintf(fp,"%d",peo[m].out);
    }
    fclose(fp);
    m++;
    return 0;
}


int Read()
{
    FILE *fp;
    int i=0,m=0;
    fp=fopen("D:\\people_dat","ab+");
    if(fp==NULL)
    {printf("File open error!\n");
    exit(1);
    }
    else
    {
        do{
            fscanf(fp,"%s",peo[i].name);
            fscanf(fp,"%d",peo[i].year);
            fscanf(fp,"%d",peo[i].month);
            fscanf(fp,"%d",peo[i].in);
            fscanf(fp,"%d",peo[i].out);
            m++;i++;
        }while(feof(fp)!=0);

    }
    fclose(fp);
    return 0;

}

整体貌似没毛病，不过fscanf在输入数字时要记得加&

你的m是全局变量吗？

是全局变量

毛病太大了，这段循环咋写的
for(i=0;i<m;i++)        fprintf(fp,"%s",peo[m].name);        fprintf(fp,"%d",peo[m].year);        fprintf(fp,"%d",peo[m].month);        fprintf(fp,"%d",peo[m].in);        fprintf(fp,"%d",peo[m].out);