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How to Create Basic Calculator in Python Tutorial

Submitted by razormist on Wednesday, January 10, 2024 - 23:53.

In this tutorial, we will create a "How to Create a Basic Calculator in Python". The purpose of this tutorial is to teach you the process of building a calculator. We will try to understand the steps involved in making this calculator. I will provide a sample program to demonstrate the actual coding of this tutorial.

This tutorial is simple and easy to understand; just follow the instructions I provide, and you can also do it yourself with ease. The program give you the basic functionality of the calculator app. I will do my best to provide you with the most simplified method of creating this program, called "Basic Calculator". So, let's start with the coding.

Getting Started:

First you will have to download & install the Python IDLE's, here's the link for the Integrated Development And Learning Environment for Python https://www.python.org/downloads/.

Creating Main Function

This is the main function of the application. The following code will display the GUI of calculator in terminal console . To do this, simply copy and paste these blocks of code into the IDLE text editor.
  1. def add(x, y):
  2.     return x + y
  3.  
  4. def subtract(x, y):
  5.     return x - y
  6.  
  7. def multiply(x, y):
  8.     return x * y
  9.  
  10. def divide(x, y):
  11.     return x / y
  12.  
  13. while True:
  14.     print("\n\n========== Basic Calculator ==========\n\n")
  15.     print("Choose an operation: ")
  16.     print("1.Add")
  17.     print("2.Subtract")
  18.     print("3.Multiply")
  19.     print("4.Divide")
  20.  
  21.     choice = input("Enter your choice: ")
  22.  
  23.  
  24.     if choice in ('1', '2', '3', '4'):
  25.         try:
  26.             num1 = float(input("Enter first number: "))
  27.             num2 = float(input("Enter second number: "))
  28.         except ValueError:
  29.             print("Invalid input. Please enter a number.")
  30.             continue
  31.  
  32.         if choice == '1':
  33.             print(num1, "+", num2, "=", add(num1, num2))
  34.  
  35.         elif choice == '2':
  36.             print(num1, "-", num2, "=", subtract(num1, num2))
  37.  
  38.         elif choice == '3':
  39.             print(num1, "*", num2, "=", multiply(num1, num2))
  40.  
  41.         elif choice == '4':
  42.             print(num1, "/", num2, "=", divide(num1, num2))
  43.        
  44.  
  45.         next_calculation = input("Try another calculation? (yes/no): ")
  46.         if next_calculation == "no":
  47.           break
  48.     else:
  49.         print("Invalid Input")

In the code that I provided, we first created several functions to handle operations for our calculator, such as adding and subtracting numbers.

Then, we proceed to enclose the entire code with a while loop to ensure the continuation of the program. To get the result, we declare the operation function that appends the two numbers to it.

Output:

The How to Create Basic Calculator in Python source code that I provide can be download below. Please kindly click the download button.

There you have it we successfully created How to Create Basic Calculator in Python. I hope that this simple tutorial help you to what you are looking for. For more updates and tutorials just kindly visit this site. Enjoy Coding!

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