//---------------------------------------------------
// Purpose: To demonstrate several ways to define
//          functions to calculate the min/max.
// Author:  John Gauch
//---------------------------------------------------

#include <ctime>
#include <cstdlib>
#include <iostream>
using namespace std;

// Function that returns the max value of two values
float find_max1(const float num1, 
                const float num2)
{
   if (num1 >= num2) 
      return num1;
   else 
      return num2;
}

// Function that stores max in reference parameter
void find_max2(const float num1, 
               const float num2,
               float & max)
{
   if (num1 >= num2) 
      max = num1;
   else 
      max = num2;
}

// Function that returns the max value of three values
float find_max3(const float num1, 
                const float num2,
                const float num3)
{
   if ((num1 >= num2) && (num1 >= num3))
      return num1;
   else if ((num2 >= num1) && (num2 >= num3))
      return num2;
   else 
      return num3;
}

// Function that returns the max value of three values
float find_max4(const float num1, 
                const float num2,
                const float num3)
{
   return find_max1(num1, find_max1(num2, num3));
}

// Function that stores max in reference parameter
void find_max5(const float num1, 
               const float num2,
               const float num3,
               float & max)
{
   if ((num1 >= num2) && (num1 >= num3))
      max = num1;
   else if ((num2 >= num1) && (num2 >= num3))
      max = num2;
   else 
      max = num3;
}

// Function that stores max in reference parameter
void find_max6(const float num1, 
               const float num2,
               const float num3,
               float & max)
{
   max = num1;
   if (max < num2)
      max = num2;
   if (max < num3)
      max = num3;
}

// Function that stores min/max in reference parameters
void find_min_max(const float num1, 
                  const float num2,
                  float & min,
                  float & max)
{
   if (num1 < num2)
   { 
      min = num1; 
      max = num2; 
   }
   else
   { 
      min = num2; 
      max = num1; 
   }
}

// Main program to test functions above
int main()
{
   // Create random test data
   srandom(time(NULL));
   float val1 = random() % 100;
   float val2 = random() % 100;
   float val3 = random() % 100;
   float min = 0;
   float max = 0;
   
   // Call function and print results
   max = find_max1(val1, val2);
   cout << "\ntesting find_max1" << endl
        << " val1: " << val1 << endl
        << " val2: " << val2 << endl
        << " max: " << max << endl;

   // Call function and print results
   find_max2(val1, val2, max);
   cout << "\ntesting find_max2" << endl
        << " val1: " << val1 << endl
        << " val2: " << val2 << endl
        << " max: " << max << endl;

   // Call function and print results
   max = find_max4(val1, val2, val3);
   cout << "\ntesting find_max4" << endl
        << " val1: " << val1 << endl
        << " val2: " << val2 << endl
        << " val3: " << val3 << endl
        << " max: " << max << endl;

   // Call function and print results
   find_max6(val1, val2, val3, max);
   cout << "\ntesting find_max6" << endl
        << " val1: " << val1 << endl
        << " val2: " << val2 << endl
        << " val3: " << val3 << endl
        << " max: " << max << endl;

   // Call function and print results
   find_min_max(val1, val2, min, max);
   cout << "\ntesting find_min_max" << endl
        << " val1: " << val1 << endl
        << " val2: " << val2 << endl
        << " min: " << min << endl
        << " max: " << max << endl;
   return 0;
}