Python Programming :

Mathematical Operators

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ENGAGE

Can you find the 3 mistakes in this code?

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Engage

1. Print needs to written in lowercase.

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• Messages to be printed need to be surrounding in quotes.

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• The variable “a” needs to be outside the quotes.

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Mathematical Operators

Learning Objective:

I can utilise mathematical operators in my programs.

Learning outcome:

Write a program in python that can meet the required needs.

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iCan()

iCan.Explore()

I have used addition within my program to add two user input numbers together.

iCan.Enhance()

I have improved my code to include all mathematical operators to apply to the user's input numbers.

iCan.Excel()

I have improved my code to give the user the option on which mathematical operator to apply to their input numbers.

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Mathematical operators

Computers are able to perform simple and complex mathematical functions considerably faster than humans.

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Using Python, you can code a sum which would be very difficult to solve using a simple calculator

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How to open Python – A reminder

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What's the difference

What the difference between the following statements?

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Types them in one at a time

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Press the ‘F5’ key on your keyboard and see what happens!

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Strings and Integers

Quote marks are used by Python to specify ‘strings of text’ meaning Python will print the exact phrase

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Numbers on their own are treated as ‘integers’ or whole numbers

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Variables

This isn’t a useful calculator because we have to ‘Hard code’ the numbers.

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We can use variables to avoid this

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Copy the example and press F5

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input()

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We can use the input() code from last lesson to allow the user to choose their own example

Press F5 and see what happens

Casting

• By default, Python treats all input() as text strings.
• We need to tell Python to treat these inputs as integers, to do this we use ‘casting’ to switch the variable from a string to an integer

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Onenote

Using the example below to help you. Complete the explore section on your onenote.

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Excel (support)

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Make your code better by allowing the user to choose which mathematical operator the program should use.

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Hints

• You will need to ask the user what type of operator they need.
• You will need to check what they have chosen using if/elif/else.