#Structured Programming Worksheet 2 Question 4
#program to find the maximums of sets of three numbers
#until the user enters three zeroes
#It then calculates and outputs the average of the maximums

#written as a series of subroutines, but uses global variables
#see max as subs local vars.py for a version passing parameters
#and using no global variables



def initialise():
    global total, n   
    print (
        """
program finds the maximums of sets of three numbers.\n
Enter three zeroes when all numbers entered.\n
Proram then calculates and outputs the average of the maximums
    """
    )
    total = 0
    n = 0
    
def promptForNumbers():
    global num1, num2, num3
    print("Please enter first number ")
    num1 = int(input())
    print("Please enter second number ")
    num2 = int(input())
    print("Please enter third number ")
    num3 = int(input())

def findMax():
    global num1, num2, num3,maxnum
    maxnum = num1
    if num2>maxnum:
        maxnum = num2
    if num3>maxnum:
        maxnum = num3
    #endif
    print ("Max of the three numbers is is ",maxnum)

def performCalculations():
   global total, n, maxnum
   total = total + maxnum
   n=n+1
     

    
def processData():
    global num1, num2, num3, total, n, maxnum 
    promptForNumbers()
    
    while num1!=0 and num2!=0 and num3!=0:
        findMax()
        performCalculations()
        promptForNumbers()
#endwhile

def calculateAverage():
    global total, n
    average = total/n
    print("Average of maximums is ",average)

#Main program
initialise()
processData()
calculateAverage()