598 : 문자열1 - 자가진단6

#include <stdio.h>
#include <string.h>
 
#pragma warning (disable:4996)
 
int main()
{
    char letter;
    do
    {
        scanf(" %c", &letter);
 
        if (('A' <= letter) && (letter <= 'Z')) {
            printf("%c\n", letter);
        }
        else if (('a' <= letter) && (letter <= 'z')) {
            printf("%c\n", letter);
        }
        else if (('0' <= letter) && (letter <= '9')) {
            printf("%d\n", letter);
        }
        else
            break;
    } while (1);
 
 
    return 0;
}