//Perimeter and Area
//October 22 2007
//Computes the total perimeter and area, when the user inputs the width and length of a rectangle.


#include<iostream.h>


//Function: get_data
//Stores the width and length from the user's input
//Precondition: None
//Postcondiction: Two values, width and length
void get_data (double & rectWidth, double & rectLength);

//Function: Area
//Computes Area, using given width and length
//Precondiction: Two numbers, width and length
//Postcondiction: A number representing the rectangle's area
double rectArea (double rectWidth, rectLength);
	
//Function: Perimeter
//Computes perimeter, using given width and length
//Precondiction: Two numbers, width and length
//Postcondiction: A number representing the rectangle's perimeter
double rectPerimeter (double rectWidth, rectLength);
	
//Function: printResults
//Prints the results of both functions
//Precondiction: Four numbers, width, length, area, and perimeter
//Postcondiction: None
void printResults(double rectWidth, double rectLength, double area, double perimeter);
	
	
int main()
{

	//Variable Identifier
	double area, perimeter, rectWidth, rectLength;

	//Functions to get input
	get_data (rectWidth, rectLength);
	
	//Functions to solve problems
	area = rectArea (rectWidth, rectLength);
	perimeter = rectPerimeter (rectWidth, rectLength);
	
	//Functions to print
	printResults(rectWidth, rectLength, area, perimeter);
	
	return 0;
	
}
	
	
	//Function: get_data
	//Stores the width and length from the user's input
	//Precondition: None
	//Postcondiction: Two values, width and length
	void get_data (double & rectWidth, double & rectLength);
	
	
	{

		//Ask the user for width and length
		cout <<"Input the rectangle's width and press enter.";
		cin >> rectWidth;
		cout <<"Input the rectangle's length and press enter.";
		cin >> rectLength;
		
	}
	

	//Function: Area
	//Computes Area, using given width and length
	//Precondiction: Two real numbers
	//Postcondiction: A real number representing the rectangle's area
	double rectArea (double rectWidth, rectLength);


	{

	return rectWidth * rectLength;
	
	}

	
	//Function: Perimeter
	//Computes perimeter, using given width and length
	//Precondiction: Two numbers, width and length
	//Postcondiction: A number representing the rectangle's perimeter
	double rectPerimeter (double rectWidth, rectLength);
	
	
	{
	
		return (rectWidth * 2 + rectLength * 2);
	
	}
	
	
	//Function: printResults
	//Prints the results of both functions
	//Precondiction: Four numbers, width, length, area, and perimeter
	//Postcondiction: None
	void printResults(double rectWidth, double rectLength, double area, double perimeter);
	
	
	{
	
	cout << "A length of "<< rectLength << endl <<" and with a width of "<< rectWidth << endl;
	cout << "An area of "<< rectArea << endl" and an perimeter of "<< rectArea << endl;
	
	}