为什么我最后输出的“学号”会成数字4356560？？？？？？？？
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define M 100
struct information{
char name[20];
char grade[4];
int num;
}em[100];
void menu();
int  input();
void save();
void display();
void menu()
{
puts("1.input inform");
puts("2.save the inform");
puts("3.Display inform");
puts("4.Exit");
printf("\n");
}
void main()
{
int n,flag,b;
    char a;
    menu();
    do
    {
        printf("Enter your Choice(1--5):\n");
        scanf("%d",&n);
        if(n>=1&&n<=4)
        {
            flag=1;
            break;
        }
        else
        {
            flag=0;
            printf("your Choice is false,Enter your Choice!");
    }}
    while(flag==0);
    while(flag==1)
    {
        switch(n)
        {
        case 1:b=input();break;
        case 2:save(b);break;
        case 3:display(b);break;
        case 4:exit(0);break;        
    }
        getchar();
        printf("请输入y继续\n");
        scanf("%c",&a);
        if(a=='y')
        {flag=1;
        system("cls");
        menu();
        printf("Enter your Next Choice(1--3):\n");
        scanf("%d",&n);
        printf("\n");
        }
        else
        exit(0);
    }
}

int input()
{
int i,m;
printf("Please Enter the number of student(1--100):\n");
scanf("%d",&m);
for(i=0;i<m;i++)
{   printf("\t姓名:");scanf("%s",&em[i].name);getchar();
    printf("\t成绩等级:");scanf("%s",&em[i].grade);getchar();
    printf("\t学号:");scanf("%d",&em[i].num);getchar();}
printf("\n 创建完毕!\n");
return m;
}
void save(int m)
{
    int i;
    int a;
     FILE *fp;
   if((fp=fopen("file1.dat","w"))==NULL)
    {
        printf("cannot open file1\n");
        exit(0);
    }
    for(i=0;i<m;i++)
        fprintf(fp,"%s        %s        %d",em[i].name,em[i].grade,&a);
    em[i].num=a;
    printf("存储完毕\n");
    fclose(fp);}
void load(int m)
{
    FILE*fp;
    int i=0;
    int a;
    if((fp=fopen("file1.dat","r"))==NULL)
    {
        printf("can't open file1\n");
        exit(0);
    }
    else
    {
        do
        {
            fscanf(fp,"%s%s%d",&em[i].name,&em[i].grade,&a);
            i++;
        }
        while(i<m);
    }
    fclose(fp);
    }
void display(int m)
{
    int i,a=0,b=0,c=0,d=0,e=0;
    printf("---------------同学记录-----------------\n");
    printf("%s%15s%15d\n","姓名","等级","学号");
    for(i=0;i<m;i++)
    printf("\n%s\t%9s\t%10d\t\n",em[i].name,em[i].grade,em[i].num);
    {printf("\n---------各等级成绩的人数------------\n");
   if(em[i].grade[4]=='A')a=a+1;
   if(em[i].grade[4]=='B')b=b+1;
   if(em[i].grade[4]=='C')c=c+1;
   if(em[i].grade[4]=='D')d=d+1;
   if(em[i].grade[4]=='E')e=e+1;}
    {printf("A:%d B:%d C:%d D:%d E:%d",a,b,c,d,e);}
    getchar();
}

多调试几下。。自己能找到原因的。

我搞了好久

fscanf(fp,"%s%s%d",&em[i].name,&em[i].grade,&a);
em[i].num = a;    // 貌似加上这个就可以了。或者直接 fscanf(...&em[i].num)
i++;