#include <algorithm>
#include <cctype>
#include <iostream>
#include <string>

int main() {
    std::string chaine = "ABcdEFgh Ij";

    std::transform(chaine.begin(), chaine.end(), chaine.begin(), ::toupper);
    std::cout << "Transformer en majuscules: " << chaine << std::endl;

    std::transform(chaine.begin(), chaine.end(), chaine.begin(), ::tolower);
    std::cout << "Transformer en minuscules: " << chaine << std::endl;

    return EXIT_SUCCESS;
}