#include <iostream>
#include <cmath>

#include "mysqrt.h"

using namespace std;
int main()
{
    double input;
    double sq, mysq;

    do {
        cout << "Enter a number (negative to quit)" << endl;
        cout << ">> ";
        cin >> input;
        if (input >= 0) {
            mysq = mysqrt(input);
            sq = sqrt(input);
            cout << "mysqrt(" << input << ") = " << mysq << endl;
            cout << "sqrt("   << input << ") = " << sq << endl;
            cout << "sqrt and mysqrt differ by " << abs(sq - mysq) << endl;
        }
    } while (input >= 0);
    
    return 0;
}