question4.cpp

/*
 * Write a program using functions that determines whether a character input by a
 * user is uppercase or lower case.
 */

#include <iostream>
#include <cctype>

// Function to determine whether the character entered by the user is in upper case or lower case
void determineCase(char character) {
    if (std::isalpha(character)) {
        if (std::isupper(character)) {
            std::cout << "The character '" << character << "' is uppercase.\n";
        } else {
            std::cout << "The character '" << character << "' is lowercase.\n";
        }
    } else {
        // Gracefully handle a case where the user enters a number
        std::cout << "Invalid input! Please enter a single letter.";
    }
}

int main() {
    // Declaration of variables
    char character;

    // Prompt the user to enter a character
    std::cout << "Enter a single character (letter): ";
    std::cin >> character;

    // Call our function
    determineCase(character);

    return 0;
}