/* Title      - Three Means
 * File name  - Lab09
 * Programmer - 415 Erich Musick
 * IPO        - Input - User inputs two positive integers
                Processing - Arithmetic, geometric, and harmonic means are
                  calculated
                Output - Arithmetic, geometric, and harmonic means are displayed
*/

//---------------------Start Header Files------------------------------------

//#include "iostream.h"
#include "waittoclose.h"  // Add to project waittoclose.cpp
//#include "apstring.h"     // Add to project apstring.cpp
//#include "randgen.h"      // Add to project randgen.cpp
#pragma hdrstop
//#include "apvector.h"     // DO NOT ADD TO PROJECT apvector.cpp
//#include "apmatrix.h"     // DO NOT ADD TO PROJECT apmatrix.cpp

//----------------------End Header Files-------------------------------------

// Arithmetic Mean
  /* purpose    - Calculate the arithmetic mean, using the formula (a+b)/2
   * parameters - a - a short containing the first integer (process)
                - b - a short containing the second integer (process)
   * input      - None.
   * process    - Arithmetic mean is calculated
   * output     - None.
   * return     - aMean - arithmetic mean
   */
double ArithmeticMean(short a, short b) {
  double aMean;

  aMean = double(a)+double(b) / 2.;

  return aMean;
}

// Geometric Mean
  /* purpose    - Calculate the geometric mean, using the formula square root of
                    the product of the two shorts
   * parameters - a - a short containing the first integer (process)
                - b - a short containing the second integer (process)
   * input      - None.
   * process    - Geometric mean is calculated
   * output     - None.
   * return     - gMean - geometric mean
   */
double GeometricMean(short a, short b) {
  double gMean;

  gMean = sqrt(double(a)*double(b));

  return gMean;
}

// Harmonic Mean
  /* purpose    - Calculate the harmonic mean, using the formula two divided by
                    the sum of the inverses of a and b

   * parameters - a - a short containing the first integer (process)
                - b - a short containing the second integer (process)
   * input      - None.
   * process    - Harmonic mean is calculated
   * output     - None.
   * return     - hMean - harmonic mean
   */
double HarmonicMean(short a, short b) {
  double hMean;

  hMean = 1. / double(a) + 1. / double(b);
  hMean = 2. / hMean;

  return hMean;
}

//-------------------------Start Main----------------------------------------
int main() {
  short a;
  short b;
  
  cout << "Enter two positive integers a and b ==> ";
  cout << endl;
  cout << "a? ";
  cin >> a;
  cout << "b? ";
  cin >> b;

  cout << endl;
  cout << "Arithmetic mean of ";
  cout << a;
  cout << " and ";
  cout << b;
  cout << " = ";
  cout << ArithmeticMean(a,b);
  cout << endl;

  cout << endl;
  cout << "Geometric mean of ";
  cout << a;
  cout << " and ";
  cout << b;
  cout << " = ";
  cout << GeometricMean(a,b);
  cout << endl;

  cout << endl;
  cout << "Harmonic mean of ";
  cout << a;
  cout << " and ";
  cout << b;
  cout << " = ";
  cout << HarmonicMean(a,b);
  cout << endl;

  return 0;
}
//--------------------------End Main-----------------------------------------

/*               LAB09 by 415 ERICH MUSICK   11:36 on Oct  4 2001

Enter two positive integers a and b ==>
a? 5
b? 9

Arithmetic mean of 5 and 9 = 7

Geometric mean of 5 and 9 = 6.7082

Harmonic mean of 5 and 9 = 6.42857

'Esc' closes window.*/