std::isdigit [ tutorial ]

#include <iostream>
#include <locale>
#include <string>

bool main() {
    std::string text("Number 5 is the best!");
    std::locale loc;

    for(unsigned short int len = 0; len != text.length(); len++) {
        if(!std::isdigit(text[len],loc)) {
            std::cout << text[len] << " is not a number" << std::endl;
        }
        else {
            std::cout << text[len] << " is a number" << std::endl;
        }
    }
    system("pause");
    return true;
}