高手教我!!!!!!11

void enter()
{
static o=0;
printf("\n学号:");
scanf("%u",&students[o].stu_num);

printf("\n姓名:");
scanf("%s",&students[o].stu_name);

printf("\n性别:");
scanf("%s",&students[o].sex);

printf("\n年龄:");
scanf("%u",&students[o].age);

printf("\n籍贯:");
scanf("%u\n",&students[o].birth);
o++;
FILE *fp;
int s;
if((fp=fopen("students.txt","wb"))==NULL)
{
printf("\n不能打开文件\n");
}
if (fwrite(&students[o],sizeof(struct student),1,fp)!=1)
{
printf("\n保存信息出错!\n");
break;
}
printf("\n保存信息成功!\n");
fclose(fp);
}

int pass()
{
char pword[5]={"1234"};
char password[5];
printf("请输入用

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