L3_T1

#include <iostream>
#include <cmath>

using namespace std;
double ForProduct(double x, int n);
double WhileProduct(double x, int n);
double DoProduct(double x, int n);

int main()
{
    double x;
    int n;

    while(true)
    {
        cout << "\nInput x, n"<< endl;
        cin >> x >> n;

        if(x > 0 && n > 0) break;
        cout << "\nIncorrect input values!";
    }

    cout << "Result with for: " << ForProduct(x, n) << endl
         << "Result with while: " << WhileProduct(x, n) << endl
         << "Result with do-while: " << DoProduct(x, n) << endl;

    return 0;
}
double ForProduct(double x, int n)
{
    double product = 1;

    for(int i = 1; i <= n; i++)
    {
        product *= pow(x, 3*n);
    }
    return product;
}
double WhileProduct(double x, int n)
{
    double product = 1;
    int i = 1;

    while(i <= n)
    {
        product *= pow(x, 3*n);
        i++;
    }
    return product;
}
double DoProduct(double x, int n)
{
    double product = 1;
    int i = 1;
    do
    {
         product *= pow(x, 3*n);
         i++;
    }
    while(i <= n);
    return product;
}