Convert Uppercase Letter to Lowercase

The code has been modified slightly and now uploaded to the site.

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411.cpp

#include <iostream>
using namespace std;

int main(){
    char letter;

    std::cout << "Enter an uppercase letter: \n";
    std::cin >> letter;

    letter = tolower(letter);

    std::cout << "The lowercase letter is " << letter << "\n";
}

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