以下程序的功能是根据输入的"y"("Y")与"n"("N"),在屏幕上分别显示出"This is YES."与"This is NO."。请填空。 #include
void YesNo(char ch) {switch(ch) {case 'y': case 'Y':printf("\nThis is YES.\n");【1】; case 'n': case 'N':printf("\nThis is NO.\n"); } } main() {char ch; printf("\nEnter a char 'y','Y' or 'n','N':"); ch=【2】; printf("ch:%c",ch); YesNo(ch); }