2/21 class

#include <iostream>

int main() {
    int n = 0;
    int s = 0;
    //std::cout << "**" << std::endl;


    std::cout << "Enter a number: " << std::endl;
    std::cin >> n;

    while (n < 0 || n > 30 || std::cin.fail()) {
        if (std::cin.fail()) {
            std::cin.clear();
            std::cin.ignore(100, '\n');
        }
        std::cout << "Enter a number: " << std::endl;
        std::cin >> n;

    }
    for (int i = 0; i <= n; i++) {
        for (int j = 0; j < i; j++) {
            std::cout << "*";
        }

    std::cout << std::endl;
}

        return 0;
    }