#include <iostream>
// this function computes the length of the hypotenuse
// given the lengths of the two sides.

// prototype declarations
double hypotenuse(double x, double y);

int main(void)
{
    double a, b;

    cout << "Enter a and b: ";
    cin >> a;
    cin >> b;

    cout << "The hypotenuse has length " << hypotenuse(a,b) << endl;
}

double hypotenuse(double x, double y)
{
    return sqrt(x*x+y*y);
}