C中switch...case的应用

#include<stdio.h>
int main()
	{
		int	grade,Agrade,Bgrade;
		scanf("%d,%d,%d",&grade,&Agrade,&Bgrade);//*grade的值确定case工作范围，Agrade与Bgrade根据输入值，判定true/false
	switch(grade)
	{
    case 0: switch(Agrade==0)
	 {
	 case 0:printf("this is Agrade 0\n");break; //*此处break中断，只结束switch(Agrade==0)的判断
	 case 1:printf("this is Agrade 1\n");break;
	 }
	case 1: switch(Bgrade==0)
    {
	case 0:printf("this is Bgrade 0\n");break;
	case 1:printf("this is Bgrade 1\n");break;
    }
	default:printf("sucess!!");
	}
	getchar();
	getchar();
	getchar();
	getchar();
	getchar();
	}#include<stdio.h>
int main()
	{
		int