Chapter 3
 5, 9
 
 ==Constants
 1 gallon paint per 115 sq ft 
 or 
 115 sq ft per 1 gallon
 Constant Real SQFT_PER_GALLON = 115
 
 8 hours labor per 115 sq ft
 Constant Real SQFT_PER_HOUR = 115 / 8
 Constant Real SQFT_PER_HOUR = 14.375

 $20 dollars per hour for labor
 Constant Real COST_PER_HOUR = 20
 
 ==Inputs 
 sqFtPainted 
 pricePerGallon
 
 
 ==Process
 
 gallonsNeeded = sqFtPainted / SQFT_PER_GALLON
 hoursRequired = sqFtPainted / SQFT_PER_HOUR
 costPaint = gallonsNeeded * pricePerGallon
 costLabor = hoursRequired * COST_PER_HOUR
 costTotal = costPaint + costLabor
 
 
 ==Outputs
 gallons of paint required
 Real gallonsNeeded
 
 hours of labor required
 Real hoursRequired
 
 cost of the paint
 Real costPaint
 
 cost of labor charges
 Real costLabor
 
 cost total of the job
 Real costTotal
 
 =Top Down Design
 showIntro()
 getInputs()
 calcGallonsNeeded()
 calcHoursForJob()
 calcCostPaint()
 calcCostLabor()
 showResults()
 
 // Global constants for Sq Ft. per Gallon and Sq Ft per Hour
 Constant Real SQFT_PER_HOUR = 14.375
 Constant Real SQFT_PER_GALLON = 115
 Constant Real COST_PER_HOUR = 20
 
 // main module
 Module main()
	// Local Variables
	Declare Real sqFtPainted, pricePerGallon, gallonsNeeded
	Declare Real costPaint, costLabor, hoursRequired
	
	// Show intro
	Call showIntro()
	
	// Get the price for the paint and per Gallon
	Call getInputs(sqFtPainted, pricePerGallon)
	
	// Calculate the gallons needed which will be passed by Reference 
	// We will see this when we write the function
	Call calcGallonsNeeded(sqFtPainted, gallonsNeeded)
	
	// Calculate the hours needed to complete the job which 
	// *hoursRequired* passed by Reference
	Call calcHoursForJob(sqFtPainted, hoursRequired)
	
	// Calculate the cost of the paint 
	// *costPaint* passed by Reference
	Call calcCostPaint(gallonsNeeded, pricePerGallon, costPaint)
	
	// Calculate the cost of the labor 
	// *costLabor* passed by Reference
	Call calcCostLabor(gallonsNeeded, costLabor)
	
	// Show the results
	// Everything passed by value
	Call showResults(gallonsNeeded, hoursRequired, costPaint, costLabor)
End Module // main

Module showIntro()
	Display "This is the pain program that will calculate gallons needed,"
	Display "hours required to complete the job, and calculate the price"
	Display "of the paint, the labor, and the total cost"
	Display "User inputs area to be painted and the price per gallon for paint"
End Module // showIntro()

Module getInputs(Real Ref areaPainted, Real Ref pricePerGallon)
	Display "Enter the area painted in Square Feet"
	Input areaPainted
	Display "Enter the price per gallon for the paint"
	Input pricePerGallon
End Module

Module calcGallonsNeeded(Real area, Real Ref gallonsNeeded)
	gallonsNeeded = area / SQFT_PER_GALLON
End Module

Module calcHoursForJob(Real area, Real Ref hoursRequired)
	hoursRequired = area / SQFT_PER_HOUR
End Module

Module calcCostPaint(Real gallonsNeeded, Real pricePerGallon, Real ref costPaint )
	costPaint = gallonsNeeded * pricePerGallon
End Module

Module calcCostLabor(Real hoursRequired,  Real ref costLabor )
	costLabor = hoursRequired * COST_PER_HOUR
End Module

// Output the results to our user
module showResults(Real gallonsNeeded, Real hoursRequired, Real costPaint, Real costLabor)
	Declare Real total
	total = costPaint + costLabor
	Display "The gallons of paint required is ", gallonsNeeded
	Display "The hours of labor required is ", hoursRequired
	Display "The cost of the paint is ", costPaint
	Display "The cost of the labor is ", costLabor
	Display "The total cost is ", total
End Module