Chapter_4_Programming_Assignment_3

# ------------------------------------------------------------
#Student: Austin Wells
#Class: CIS122
#Date: 4/13/2015
#Program Title: Chapter 4 Programming Excercise 3.py
#(Mass and Weight)
#Program Description:  The program prompts the user for an objects 
#mass. If the object weighs more than 1000 Newtons it will display
#a message that the object was to heavy, If the object is less than 10
#Newtons, a message will display its too light.
# ------------------------------------------------------------

GRAVITY_CONST = 9.8

# evaluates the weight and prints out if it is too heavy or light
def measureWeight(weight):
	   
	if (weight > 1000.0):

print 'The weight of {} Newtons is too heavy' .format(weight)

elif (weight < 10.0):

print 'The weight of {} Newtons is too light' .format(weight)
    
	else:
    
		print 'The weight of {} Newtons is just right' .format(weight)

# prompts user for input.
def promptForNumber(strPrompt):
            
    userInput = float(raw_input(strPrompt + ": "))
    
    print '{}' .format(userInput)
    
    return userInput

#calculates weight
def calculateWeight(userInputMass):
    
    weight = userInputMass * GRAVITY_CONST
            
    return weight
    
#main driver function    
def main():   	
    
		try:
			userInput = promptForNumber("Please enter an objects mass in kilograms")			
		
		except (ValueError):
            
			print '\n\nInvalid input. You have entered a non integer. Please enter an objects mass'
            
		except (EOFError):
            
			print '\n\nInvalid input. You have forgotten to add input. Please Reset program and Please enter the objects mass'
            
		else:			
			weightCalculated = calculateWeight(userInput)
            
			measureWeight(weightCalculated)
main()

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