Calculator program using Python

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

• User chooses 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.

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

# 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