#include <iostream>
#include <cmath>
using namespace std;

// illustrates use of math function returning a value

int main()
{
    double value;
	//double result;

    cout << "enter a positive number ";
    cin >> value;
    // result = sqrt(abs(value));
    cout << "square root of " << value << " = " << sqrt(abs(value)) << endl;

    return 0;
}