Basic calculator program using Python

Difficulty Level : Easy
Last Updated : 19 Apr, 2020

Create a simple calculator which can perform basic arithmetic operations like addition, subtraction, multiplication or division depending upon the user input.
Approach :

User choose the desired operation. Options 1, 2, 3 and 4 are valid.

Two numbers are taken and an if…elif…else branching is used to execute a particular section.

Using functions add(), subtract(), multiply() and divide() evaluate respective operations.

Example :

Please select operation -
1. Add
2. Subtract
3. Multiply
4. Divide
Select operations form 1, 2, 3, 4 : 1
Enter first number : 20
Enter second number : 13
20 + 13 = 33

# Python program for simple calculator 
  
# Function to add two numbers  
def add(num1, num2): 
    return num1 + num2 
  
# Function to subtract two numbers  
def subtract(num1, num2): 
    return num1 - num2 
  
# Function to multiply two numbers 
def multiply(num1, num2): 
    return num1 * num2 
  
# Function to divide two numbers 
def divide(num1, num2): 
    return num1 / num2 
  
print("Please select operation -\n" \ 
        "1. Add\n" \ 
        "2. Subtract\n" \ 
        "3. Multiply\n" \ 
        "4. Divide\n") 
  
  
# Take input from the user  
select = int(input("Select operations form 1, 2, 3, 4 :")) 
  
number_1 = int(input("Enter first number: ")) 
number_2 = int(input("Enter second number: ")) 
  
if select == 1: 
    print(number_1, "+", number_2, "=", 
                    add(number_1, number_2)) 
  
elif select == 2: 
    print(number_1, "-", number_2, "=", 
                    subtract(number_1, number_2)) 
  
elif select == 3: 
    print(number_1, "*", number_2, "=", 
                    multiply(number_1, number_2)) 
  
elif select == 4: 
    print(number_1, "/", number_2, "=", 
                    divide(number_1, number_2)) 
else: 
    print("Invalid input") 

Output :

Please select operation -
1. Add
2. Subtract
3. Multiply
4. Divide
Select operations form 1, 2, 3, 4 : 1
Enter first number : 15
Enter second number : 14
15 + 14 = 29

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