Calculator Program in Python

Introduction to Calculator Program in Python

We shall be breaking down our process of creating the calculator program in python into simple steps. To help understand the concepts in depth, for creating a simple calculator program in python which can perform basic mathematical operations such as addition, subtraction, multiplication, or division, all of which depend upon the input given by the user.

The approach that we shall be following is very easy to understand.

• Prompting Input from the User. That is, we shall be accepting input for two variables.
• Define and Add operators or functions such as add(), subtract(), multiply() and divide() to estimate respective functions.
• To make it similar to the calculator, apply conditional statements (if…elif…else branching) to make it works as per User’s choice

Simple Calculator by Using Functions

Let us dive in and learn by executing each step towards creating a calculator program in python.

Step 1: Prompting Input from the User, we shall accept input for two variables.

In this step, we shall take the user's input using the input() function in python. It is the same as when we enter numbers in a real calculator to perform any arithmetic operations. We shall ask the user to input two variables using each variable's input() function.

Let’s have the program perform the prompt for the two numbers:

Code:

Output:

Step2: Define and Add operators or functions such as add(), subtract(), multiply() and divide() to estimate respective functions.

Now we are adding the functions to perform the mathematical operations such as addition, subtraction, multiplication, and division to create the computation for the calculator program in python. We also modified our input functions as integers to guide the user to perform the arithmetic operations on integers, not strings.

Code:

Output:

Above, we have described each of the four basic arithmetic operations in python using format() function. format() functions fill the placeholder and make the output formatted. The user's input was now computed for each arithmetic operation we defined.

As all the functions are getting executed described for the two numbers, we have to make it work per the user's choice. We shall use conditional statements - if…elif…else branching so that it only performs the operations based on the user’s choice of operation like in a real calculator.

Step3: To make it similar to a calculator, apply conditional statements (if…elif…else branching) to make it works as per User’s choice

To make it the user's choice based, we shall be defining each of the arithmetic operations as a function using the def function in python. We will again ask for the user's input for the mathematical operations that they want to perform.

Code:

Output:

Bravo!!! We made our calculator program in python based on the user's choice of input of numbers and operators, exactly how a real calculator works.

See Also:

• Factorial Program in Python
• Factorial Using Recursion in Python
• FizzBuzz Program in Python