内容:
#include <ctype.h>
#include <stdio.h>
main()
{
char ch, ch1;
while (1)
{
printf("input the character('q' to quit):");
ch = getchar(); /*从键盘中获得一个字符*/
ch1 = getchar(); /*ch1接收从键盘中输入的回车*/
if (ch == 'q' || ch == 'Q') /*判断输入的字符是不是q或Q*/
break; /*如果是q或Q跳出循环*/
if (isalpha(ch)) /*检测输入的是否是字母*/
printf("\n%c is a letter.\n\n", ch);
else
printf("\n%c is not a letter.\n\n", ch);
}
}