【C】#判断是不是字母#

#include <stdio.h>

int main() {
    char ch;
    while (scanf("%c", &ch) != EOF) {
        if ((ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z')) {
            printf("%c is an alphabet.\n", ch);
            getchar();
        } else {
            printf("%c is not an alphabet.\n", ch);
            getchar();
        }

    }
    return 0;
}