程序代码：

struct teacher
{
    int num;
    char  *name;
    char  sex;
    float wage;
    struct teacher *next;
};
void input()
{
struct teacher tea1;
char n[20],ch;
FILE *f;
f=fopen("e:\\1.txt","wb");
if(f==NULL)
printf("can not open file");
do
{ printf("enter number:");gets(n);tea1.num=atoi(n);
  printf("enter name:");gets(tea1.name);
  printf("enter sex:");tea1.sex=getchar();getchar();
  printf("enter wage");gets(n);tea1.wage=atof(n);
  fwrite(&tea1,sizeof(struct teacher),1,f);
  printf("have another teacher record(y/n)?");
  ch=getchar();getchar();
}while(ch=='Y'||ch=='y');
fclose(f);
}