sumFrom1to500Alt

#include <iostream>

int main()
{
    const int maxRange{ 500 };
    int num;
    bool correct{ false };

    int sum{ 0 };

    do
    {
        std::cout << "Enter number maximum 500\n";
        std::cin >> num;
        correct = num < maxRange;

        if (!correct)
        {
            std::cout << "Max range exceeded! Try again!";
        }
    } while (!correct);

    for (; num < maxRange; sum += num++);
    std::cout << "Sum is: " << sum << '\n';

    return 0;
}