单项选择题

运行下面程序时,从键盘输入字母H,则输出结果是 main() { char ch; ch=getchar(); swimh(ch) {case'H':printf("Hello!\n"); case'G':printf("Good morning!\n"); default:printf("Bye_Bye!\n"); } }

A.Hello!
B.Hello! GoodMoring!
C.Hello! Good moming! Bye_ye!
D.Hello! Bye_ye!