Homework 3, Problem 9

#define _CRT_SECURE_NO_WARNINGS
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <conio.h>

void main()
{
    char strLetter = "";
    char strLowerCaseLetter = "";

    do
    {
        printf("%c", strLetter);
        printf("Please enter an uppercase letter. \n");
        scanf("%c", &strLetter);


        if (strLetter >= 'A' && strLetter <= 'Z')
        {
            strLowerCaseLetter = strLetter + 32;
            printf("Here is the letter in uppercase: %c. Here is the letter in lowercase: %c.", strLetter, strLowerCaseLetter);
        }

    } while (strLetter < 'A' || strLetter > 'Z');
}