/************************************************\
PROGRAM: electric.cpp
PURPOSE: caculate the cost of electricity used
AUTHOR:  Tony Jinman
DATE WRITTEN: 05 April 2000
LAST UPDATE : 05 April 2000
\************************************************/
#include<iostream.h>

void main()
{//start of function main
	int present,previous,used;
	const float COSTPERUNIT=6.67;
	float owed;

	cout<<"Present meter reading: "; //present reading prompt
	cin>>present;  //value of present reading
	cout<<"Previous meter reading: "; //prevoius reading prompt
	cin>>previous;  //value of previous reading
	used=present-previous; //calculation of electricity used
	cout<<endl<<"Units used: "<<used<<endl; //display units used
	owed=used*COSTPERUNIT/100; //calculate cost of electricity used
	cout<<"Cost of electricity used: £"<<owed; //display cost
}//end of function main