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# Python Program to Make a Simple Calculator

## Simple Calculator by Making Functions

` `# Program make a simple calculator that can add, subtract, multiply``# This function adds two numbers ``def add(x, y):``   return x + y``# This function subtracts two numbers ``def subtract(x, y):``   return x - y``# This function multiplies two numbers``def multiply(x, y):``   return x * y``# This function divides two numbers``def divide(x, y):``   return x / y``print("Select operation.")``print("1.Add")``print("2.Subtract")``print("3.Multiply")``print("4.Divide")``# Take input from the user ``choice = input("Enter choice(1/2/3/4):")``num1 = int(input("Enter first number: "))``num2 = int(input("Enter second number: "))``if choice == '1':``   print(num1,"+",num2,"=", add(num1,num2))``elif choice == '2':``   print(num1,"-",num2,"=", subtract(num1,num2))``elif choice == '3':``   print(num1,"*",num2,"=", multiply(num1,num2))``elif choice == '4':``   print(num1,"/",num2,"=", divide(num1,num2))``else:``   print("Invalid input")` `

Output

`Select operation. 1.Add 2.Subtract 3.Multiply 4.Divide Enter choice(1/2/3/4): 3 Enter first number: 15 Enter second number: 14 15 * 14 = 210 `

In this program, we ask the user to 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. User-defined functions `add()``subtract()``multiply()` and `divide()`evaluate respective operations.

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