title: how make 3 functions to run in one program
body: <p>For answers please make it as simple as possible refrain from using any technique that is too advanced as I am still learning Python and do not want to jump too far ahead...</p>
  
  <p>For the def main program, I am trying to run all 3 functions in this "Main", the Summation and Multiply functions is self explanatory, the CreateIntList is suppose function takes in a sentinel value (an integer), and
  it takes in a sentinal value(int) and return a list of integers. it prompts the user to create a list of integers, using the provided sentinel value as the number the user enters to exit the creation of the list. </p>
  
  <pre><code>For each list:
  o Tell the user which number list they are creating (starting at 1)
  o Ask the user for their desired sentinel value
  o Create a lists of integers (using the given sentinel value)
  o Calculate the summation
  o Calculate the product
  o Print out:
   The entire list
   The summation of the list
   The product of the list
  
  
  
  def summation(intlist):
      output = 0
      for x in range(len(intlist)):
          output += intlist[x]
      return output
  
  def multiply(intlist):
      if len(intlist) == 0:
          output = 0
          return output
      else:
          output = 1
          for x in range(len(intlist)):
              output = intlist[x] * output
          return output
  
  def createIntList(myInt):
      createlist = []
      myInt = int(input("What do you want the sentinel to be?"))
      addNum = None
   while myInt != addNum:
          addNum = input("Please enter a number, ", myInt, "to stop: ")
          createlist.append(addNum)
      return createlist
  
  def main():
      print("Welcome to the Simple Math Helper")
      listIteration = int(input("How many list would you like to create? "))
      x = 0
      for x in range(len(listIteration)):
          print("Your are creating list #", x)
          createIntList(myInt)
          multiply(createIntList)
          summation(createIntList)
          x = x + 1
      print("Thank you for using the Simple Math Helper")
  
  
  main()
  </code></pre>
  
  <p>Projected output:</p>
  
  <pre><code>Welcome to the Simple Math Helper
  How many lists would you like to create? 1
  You are creating list #1
  What do you want the sentinel to be? 0
  Please enter a number, 0 to stop: 1
  Please enter a number, 0 to stop: 2
  Please enter a number, 0 to stop: 3
  Please enter a number, 0 to stop: 4
  Please enter a number, 0 to stop: 5
  Please enter a number, 0 to stop: 6
  Please enter a number, 0 to stop: 7
  Please enter a number, 0 to stop: 8
  Please enter a number, 0 to stop: 9
  Please enter a number, 0 to stop: 10
  Please enter a number, 0 to stop: -9
  Please enter a number, 0 to stop: -3
  Please enter a number, 0 to stop: -1
  Please enter a number, 0 to stop: 0
  For the list [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, -9, -3, -1]
  The summation is 42
  The product is -97977600
  Thank you for using the Simple Math Helper
  </code></pre>