check uppercase c++

#include <iostream>
#include <cctype>

int main() {
    char inputChar;

    std::cout << "Enter a character: ";
    std::cin >> inputChar;

    if (std::isupper(inputChar)) {
        std::cout << "The entered character is uppercase." << std::endl;
    } else {
        std::cout << "The entered character is not uppercase." << std::endl;
    }

    return 0;
}