程序代码：

#include<stdio.h>
struct stu
{
char name[10];
int num;
int age;
char addr[15];
}boya[2],boyb[2],*pp,*qq;
main()
{
    FILE *fp;
    char ch;
    int i;
    pp=boya;
    qq=boyb;
    if((fp=fopen("stu_list","wb+"))==NULL)
    {
        printf("Cannot open file strike any key exit!");
        getch();
        exit(1);
    }
    printf("\ninput data\n");
    for(i=0;i<2;i++,pp++)
        scanf("%s%d%d%s",pp->name,&pp->num,&pp->age,pp->addr);
    pp=boya;
    for(i=0;i<2;i++,pp++)
        fprintf(fp,"%s %d %d %s\n",pp->name,pp->num,pp->age,pp->
    addr);
    rewind(fp);
    for(i=0;i<2;i++,qq++)
        fscanf(fp,"%s %d %d %s\n",qq->name,&qq->num,&qq->age,qq->addr);
    printf("\n\nname\tnumber age addr\n");
    qq=boyb;
    for(i=0;i<2;i++,qq++)
        printf("%s\t%5d %7d %s\n",qq->name,qq->num, qq->age,qq->addr);
    fclose(fp);
}