HELP...

[cnbj8607]

#define LEN 20
#include<stdio.h>
#include<stdlib.h>
void main()
{
	struct student
	{
		int num;
		char name[LEN];
		char sex;
		char addr[LEN];
	};
	struct student stu;
	printf("Please enter the student number:\n");
	scanf("%d",&stu.num);
	getchar();
	printf("Please enter the name:\n");
	gets(stu.name);
	printf("Sex M(male) or F(female):\n");
	getchar(stu.sex);
	getchar();
	while(stu.sex)
	{
		if(stu.sex=='M'||stu.sex=='F') break;//此处输入M后怎么跳不出去？
		else
		{
			printf("Data error, please re-enter:\n");
			getchar(stu.sex);
			getchar();
		}
	}
	printf("Please enter the address:\n");
	gets(stu.addr);
	printf("\nStudent Number: %d\nStudent Name: %s\nStudent Sex: %c\nStudent Address: %s\n",stu.num,stu.name,stu.sex,stu.addr);
	system("Pause");
}

[BT六眼飞鱼]

#define LEN 20
#include <stdio.h>
#include <stdlib.h>

void main()
{
struct student
{
int num;
char name[LEN];
char sex;
char addr[LEN];
};
struct student stu;
printf("Please enter the student number:\n");
scanf("%d",&stu.num);
getchar();
printf("Please enter the name:\n");
gets(stu.name);
printf("Sex M(male) or F(female):\n");
scanf("%c",&stu.sex);
while(stu.sex)
{
if(stu.sex=='M'||stu.sex=='F') break;//此处输入M后怎么跳不出去？
else
{
printf("Data error, please re-enter:\n");
scanf("%c",&stu.sex);
getchar();
}
}
printf("Please enter the address:\n");
scanf("%s",&stu.addr);
printf("\nStudent Number: %d\nStudent Name: %s\nStudent Sex: %c\nStudent Address: %s\n",stu.num,stu.name,stu.sex,stu.addr);
system("Pause");
}

[BT六眼飞鱼]

LZ 拷贝一下 运行看看吧 应该是你要的效果！

[昵称很不好取]

#define LEN 20
#include<stdio.h>
#include<stdlib.h>
void main()
{
    struct student
    {
        int num;
        char name[LEN];
        char sex;
        char addr[LEN];
    };
    struct student stu;
    printf("Please enter the student number:\n");
    scanf("%d",&stu.num);
    getchar();
    printf("Please enter the name:\n");
    gets(stu.name);
    printf("Sex M(male) or F(female):\n");
    stu.sex = getchar(); //这样用~~~
    getchar();
    while(stu.sex)
    {
        if(stu.sex=='M'||stu.sex=='F') break;//此处输入M后怎么跳不出去？
        else
        {
            printf("Data error, please re-enter:\n");
            stu.sex = getchar();//这里也是~~
            getchar();
        }
    }
    printf("Please enter the address:\n");
    gets(stu.addr);
    printf("\nStudent Number: %d\nStudent Name: %s\nStudent Sex: %c\nStudent Address: %s\n",stu.num,stu.name,stu.sex,stu.addr);
    system("Pause");
}