#include <stdio.h>
#include <ctype.h>
int main(void)
{
char letter = 0; // Stores a character
printf("Enter an uppercase letter:"); // Prompt for input
scanf("%c", &letter); // Read a character
if(isalpha(letter) && isupper(letter))
printf("You entered an uppercase %c.\n", tolower(letter));
else
printf("You did not enter an uppercase letter.\n");
return 0;
}