理解getchar()

#include <stdio.h>
#include <ctype.h>

int main() {
	char ch;
	printf("Give me a letter of the alphabet, and I will give");
	printf("an ainimal name\nbeginning with that letter.\n");
	printf("Please type in a letter: type # to end my act.\n");
	while ((ch = getchar()) != '#') {
		if ('\n'== ch)
			continue;
		if (islower(ch)) {
			switch (ch) {
				case 'a': printf("argail, a wild sheep of Asia\n");
						  break;
				case 'b': printf("babirusa, a wild pig of Malay\n"); 
						  break;
				case 'c': printf("coati, racoonlike mammal\n");
						  break;
				case 'd': printf("desman, aquatic, molelike critter\n");
						  break;
				case 'e': printf("echidna, the spiny\n");
						  break;
				case 'f': printf("fisher, brownish marten\n");
						  break;
				default: printf("That's a stumper!\n");
			}
		}
		else
			printf("I recognize only lowercase letters.\n");
		while (getchar() != '\n')
			continue;
		printf("Please type another letter or a #.\n");
	}
	printf("Bye!\n");
	return 0;
}

while (getchar() != '\n')

continue;

也可写成

while (getchar() != '\n') {}

清空输入的多余字符