Chapter_5_Programming_Assignment_12

# ------------------------------------------------------------
#Student: Austin Wells
#Class: CIS122
#Date: 4/24/2015
#Program Title: Chapter 5 Programming Excercise 12.py
#(Calculating the factorial of a Number)
#Program Description:  Prompts the user for a non negative integer and returns the factorial of that number
# ------------------------------------------------------------
# total rainfall input function
def calculateFactorial(userInput):
    
    	factorial = userInput  	
			
    	for i in range(1,userInput):
                
			factorial = factorial * i            
                    	
	return factorial    
# prompts user for input.
def promptForNumber(strPrompt):
            
    userInput = int(raw_input(strPrompt + ": "))
    
    print '{}' .format(userInput)
    
    return userInput
 
#main driver function    
def main():   	
    
		try:            
			userInput = promptForNumber("Please enter a non negative integer ")
            
			factorial = calculateFactorial(userInput)
            
			print '{}! is {:0,}' .format(userInput,factorial)
		
		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'
            
		        
			
			
		
main()

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