Chapter_4_Programming_Assignment_7

# ------------------------------------------------------------
#Student: Austin Wells
#Class: CIS122
#Date: 4/14/2015
#Program Title: Chapter 4 Programming Excercise 7.py
#(Software Sales)
#Program Description:  The program prompts the user for a number of software
#packages and reutrns the total amount of the purchase based on that number. 
# ------------------------------------------------------------

SOFTWARE_BASE_COST = 99

# Prints out the quantity, discount cost, and total cost.
def printDiscountAndTotal(discountCost,quantity):
	   
		print 'With a quantity of {} the discount is ${:0,.2f} \nTotal Purchase Amount: ${:0,.2f}' .format(quantity, discountCost, calculateTotalCost(discountCost,quantity))
        
# prompts user for input.
def promptForNumber(strPrompt):
            
    userInput = int(raw_input(strPrompt + ": "))
    
    print '{}' .format(userInput)
    
    return userInput

#calculates the discount based on the quantity
def calculateDiscount(quantity):
    
    if(quantity <10):
        
    	discountCost = 0
        
    elif (quantity >= 10 and quantity <= 19):
        
        discountCost = .2 * SOFTWARE_BASE_COST
    
    elif (quantity >= 20 and quantity <= 49):
        
        discountCost = .3 * SOFTWARE_BASE_COST
       
    elif (quantity >= 50 and quantity <= 99):
        
        discountCost = .4 * SOFTWARE_BASE_COST
        
    else:
        
        discountCost = .5 * SOFTWARE_BASE_COST
        
    return discountCost

# calculate the total cost
def calculateTotalCost(discountCost,quantity):
    
    	totalCost = SOFTWARE_BASE_COST - discountCost
        
     	return totalCost
    
#main driver function    
def main():   	
    
		try:
			userInput = promptForNumber("Please enter the number of packages to purchase")			
		
		except (ValueError):
            
			print '\n\nInvalid input. You have entered a non integer. Please enter an integer'
            
		except (EOFError):
            
			print '\n\nInvalid input. You have forgotten to add input. Please Reset program and Please enter an integer'
            
		else:        
			discountCost = calculateDiscount(userInput)
            
			printDiscountAndTotal(discountCost,userInput)
main()

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