#include <iostream>
#include <iomanip>
#include <cmath>

using namespace std;

// function prototypes go here
 
float calc_square(float);
float calc_distance (float, float);
 
//****************************************************

// main program goes here

int main()
  {
  int ans;
  float dist;
 
  dist = calc_distance(3.0, 4.0);
  cout << "main program says " << dist << endl;
  
  dist = calc_distance(6.0, 8.0);
  cout << "main program says " << dist << endl;
 
  return 0;
  }
 
//****************************************************

// functions go here

float calc_square(float a)
{
  float b = 99.;     // note never used
  cout << "    entering calc_square: a = " << a << " b = " << b << endl;
  a = a * a;         // clobbering input--NOT recommended style
  cout << "    leaving calc_square: a =  " << a << " b = " << b << endl;
  return (a);
}

float calc_distance(float a, float b)
  {
    float c;          // note uninitialized

    cout << "  at entrance to calc_distance: a = "
	 << a << "    b = " << b << "    c = " << c << endl;

    c = sqrt(calc_square(a) + calc_square(b));
    cout << "  calc_distance: dist. from " << a << " to "
         << b << " is " << c << endl;

    cout << "  at exit from calc_distance: a = "
	 << a << "    b = " << b << "    c = " << c << endl;

    return (c);
  }