Assignment 2: Conditionals

Overview

The goal of this assignment is to familiarize you with conditionals, including both logical operations and relational operations.

Grading Rubric

Part 1: A simple calculator

For this part of the assignment you will write a (very) simple calculator which can (only) add, subtract, and multiply two integers. It's a good idea to work on this during your LC meeting. Create a week2 folder and add a file called calculator.py.

Specification

• Your program will ask for three inputs, one after the other -- an operation (one of '+', '-', '*'), and two ints (operands).
• Based upon the inputs, the program will add, subtract, or multiply the operands and print the result.
• You may assume that the operation input is always one of '+', '-', or '*', and you do not need to consider an "illegal" input in your code. Similarly, you may assume that the user always enters integers for the operands.

Here is an example of a sample run. The first three lines are the inputs.

  What is the first operand?
  > 31
  What is the second operand?
  > -1
  What is the operation (+,-,*)?
  > +
  31 + -1 = 30

Note that if you pass an argument to input, you can specify the "prompt" string (e.g., input("> ")). It may also be helpful to consider the following example showing how to check the contents of a string:

  >>> op = '/'
  >>> op == '/'
  True
  >>> op == '+'
  False

Part 2: An Interactive Program

Create a file called interact.py. We'll develop an interactive program in this file that meets the following specification.

Specification

For full credit, your program must do each of the following:

• Ask the user for at least two pieces of information about themselves
• Display some response that says something about the programmer
• Display some response that relates in a meaningful way to the information the user gave you.

In addition, the way in which your code accomplishes the above must satisfy the following requirements:

• Use the input() function
• Use (at least) one variable
• Use (at least) two of the operators +, -, /, and *
• Operate (at least) once on something of type int or float
• Operate (at least) once on something of type str
• Have (at least) one comparison using conditionals

Example

The previous section outlines the requirements. You're strongly encouraged to exercise your creativity in satisfying them! The following is one example of a program that satisfies the (minimum) requirements. (Yes, you'll have to take our word for it that the underlying code satisifes the implementation requirements... note the distinction between what something is doing and how it does it!)

  What is your name?
  > Cecil
  Hi Cecil! It is nice to meet you. My name is Prof. Osborn. I've been with Pomona College since 2018.
  Pick a number
  > 47
  Great! Did you know 47 + 2 = 49, and 47 * 2 = 94?
  I also like videogames and electronics projects.  Do you know how to solder?
  > Yes
  Great! That's all for now. Bye Cecil!

Coding Style

Make sure that your program is properly commented:

• You should include meaningful one-line comments that explain what your code is doing.
• Every function should include some comment at the beginning which:
  • Explains what the function does.
  • Defines the parameters.
  • Defines any return values.

In addition, make sure that you have used good style. This includes:

• Following naming conventions, e.g. all variables and functions should be lowercase with underscores separating words.
• Using good (memorable) variable names.
• Proper use of whitespace, including indenting and use of blank lines to separate chunks of code that belong together.
• Good use of conditionals.

Submission

For this lab you are required to submit the following files:

• calculator.py (remember to comment appropriately!)
• interact.py (remember to comment appropriately!)

Note that you will lose points if your submitted files are incorrectly named or if they are submitted separately. Please double check that you got this right.