cctype

The C++ header file is used to declare a set of functions to classify (and transform) individual characters. It is used in this project to detect uppercase or lowercase letters.

Installation

Insert the following snippet to the top of your code.

#incude <cctype> 

Usage

#include <iostream> // iostream is used here for input/output
#incude <cctype> // cctype is used here to convert to lowercase/uppercase

using namespace std; // to remove the need to use std:: in front of cin and cout

int main() // main function
{
    char letter; // define char letter
    cout << "What is the letter? "; // print to the console: "What is the letter?"
    cin >> letter; // ask for input from the user

    char lowerLetter; // creates char "lowerLetter"
    lowerLetter = tolower(letter); // converts char "letter" to lowercase and assigns it to "lowerLetter"

    if (lowerLetter == letter) { // if the lowercase version of "letter" is equal to the original "letter"
        cout << endl << "The letter " << letter << " is a lowercase letter."; // print to the console
    } // end if statement
    else { // if "lowerLetter" is not the same as the original "letter"
        cout << endl << "The letter " << letter << " is an uppdercase letter."; // print to the console
    } // end else statement
} // end main function