I need to develop a class to represent the data concept of sterling
currency(ie UK Pounds)
The class will use a data member 'amount' as a single floating point
number, Thus an amount of value 1.5
 would represent the sterling value of £1.50p.

The class should have operations to initialise the data, to add more
money,to subtract money, and to return the whole pounds and pence,
 a short program to illustrate is below.....

void main()

{

  Stering s1:
  s1.initialise(3, 75); // £3.75p
  s1.add (1,50);        // £5.25p
  s1.subtract (0,26);   // £4.99p

  cout << "Current total is £" << s1.pounds()
       << '-' <<s1.pence() << 'p';

}

 would produce output of £4.99p

1)
  I need to write a class specification in a good style, to include
the 'data member'
  and the prototypes of member functions.

2)
  I also need c++ code to implement each of the following;

  * member function initialise()

  * member function pounds()

  * member function pence()

  * member function add()

  * member function subtract() 

with comments to explain if possible. 

Thank you....

Hi again purplepit,

Nice to see you here again....below is the source code that conforms
to the specifications you've provided. Note that the the class
specification is within the "class Sterling{...}" clause in the code,
followed by the implementation of all member functions and then the
main method.

// BEGIN SOURCE CODE


//importing required libraries

#include <stdio.h>
#include <iostream>

// class definition

class Sterling 
{ 	
    float amount;	// representation of sterling value

	public: 	

    Sterling();		// constructor
    void initialize(int pounds, int pence);	// initialize amount
	void add(int pounds, int pence);		// add to amount
	void subtract(int pounds, int pence);	// subtract from amount
	int pounds();	// return pound value
    int pence();	// return pence value

};

Sterling::Sterling()
{
	// set amount to zero if not initialized
	amount = 0;
}

void Sterling::initialize(int pounds, int pence)
{
	// type conversions and calculations for initialization
	amount = (float)pounds + ((float)(pence%100)/100);
}

void Sterling::add(int pounds, int pence)
{
	// type conversions and calculations for adding to amount
	amount = amount + (float)pounds + ((float)(pence%100)/100);
}

void Sterling::subtract(int pounds, int pence)
{
	// type conversions and calculations for subtraction
	amount = amount - pounds - ((float)(pence%100)/100);
}

int Sterling::pounds()
{
	// casts amount to int and returns
	return (int)amount;
}

int Sterling::pence()
{
	// calculates pence as follows:
	// subtract pounds from amount
	// multiply by 100 to obtain pence int values
	// add one to account for roundoff error
	int pence = (int)((amount - pounds()) * 100) + 1;
	return pence;
}


int main() 
{ 	
	Sterling s1; 
	s1.initialize(3, 75); // £3.75p 
	
	s1.add (1,50);        // £5.25p 
	
	s1.subtract (0,26);   // £4.99p 
	
	printf("Current total is £ %i - %i p", s1.pounds(), s1.pence());
	
 
} 


// END SOURCE CODE

Please let me know if you have any problems understanding the
information above and I will respond promptly :)

Cheers!

answerguru-ga

As Brilliant and as helpful as ever!!!!!

Dear Purplepit,

You appear to be under the impression that the symbols "£" and "p" are
both used in specifying an amount in UK currency.  This is not so: as
with most other currencies, you use one or the other.  Amounts under a
pound can be specified just as pence, e.g. 37p.  Any amount can be
specified in pounds, but in this case "p" is not used, e.g. £0.37,
£5.99, £5.00.

I trust this helps.

Carnegie

Thank you very much..It does help..

Purplepit-ga