Homework 2

Split up the following program into three parts (5 files) using the standard technique of creating Source files and Header files so that the following conditions are satisfied.

• The main program module contains only the main function.
• Since the rest of the code will be written by two different programmers, add and divide must be in one module and goldenratio must reside in another. square_root_5 needs to be in the same module as goldenratio.

Use the minimum necessary include statements, prototypes and external references to accomplish integration among the various modules.

I recommend trying out your code on a compiler to make sure it all works properly before you submit the homework. Clearly label each module (by its given filename) in your submitted version.

// This is a little program to calculate the golden ratio

#include <iostream.h>

const float square_root_5 = float (2.236);

float add ( float a, float b )
{
   return a+b;
}
   
float divide ( float c, float d )
{
   return c/d;
}
      
float goldenratio ()
{
   return divide (add (square_root_5, 1), 2);
}
      	
int main ()
{
   cout << "And the golden ratio number is : " << goldenratio () << "\n";
   return 0;
}

Solution

main.cpp

#include <iostream.h>
#include "goldenratio.h"

int main ()
{
   cout << "And the golden ratio number is : " << goldenratio () << "\n";
   return 0;
}

goldenratio.cpp

#include "operations.h"

const float square_root_5 = float (2.236);

float goldenratio ()
{
   return divide (add (square_root_5, 1), 2);
}

goldenratio.h

float goldenratio ();

operations.cpp

float add ( float a, float b )
{
   return a+b;
}
   
float divide ( float c, float d )
{
   return c/d;
}

operations.h

float add ( float a, float b );
float divide ( float c, float d );