# StrangeCalculator.py
#
# Description: This program that takes a string as an input,
#              such as “24 + 16”, “30 – 5”, “10 * 4”, 36 // 2”,
#              computes the equation found in the string and
#              outputs the equation and its result such as
#              24 + 16 = 40
#
# Author: Anne Lavergne
# Date: Feb. 28 2024


def performOpOnList(anOperandList, anOperation):
  """Returns the result of performing "anOperation"
     on the operands contained in "anOperandList".
     Returns 0 if 'anOperation' is not '+','-','*' or '//'."""

  # Set result to 0 in case "anOperation" is not '+','-','*' or '//'
  result = 0
  
  # Figure out which operation to perform on the operands
  if anOperation == "+":
    # Add both operands
    result = anOperandList[0] + anOperandList[1]
    
  elif  anOperation == "-":
    # Subtract anOperand2 from anOperand1
    result = anOperandList[0] - anOperandList[1]
          
  elif  anOperation == "*":
    # Multiply both operands
    result = anOperandList[0] * anOperandList[1]
          
  elif  anOperation == "//":
    # Divide anOperandList[0] by anOperandList[1]
    result = anOperandList[0] // anOperandList[1]
    
  else:
    result = "None"
    
  # Once done, return the result produced by this function
  # or "0" if anOperation was not '+','-','*' or '//'.
  return result
  
  
#*** Main part of my program

# Create a list
theEquation = input("Please, enter an equation: ")
equationList = theEquation.split()
operandList = []
operandList.append(int(equationList[0]))
operandList.append(int(equationList[2]))
anOperation = equationList[1]
theResult = performOpOnList(operandList, anOperation)
if theResult == "None" :
  print(f"{anOperation} is an invalid operation (not '+','-','*' or '//').")
else:
  print(f"{operandList[0]} {anOperation} {operandList[1]} = {theResult}")