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Here is the source code for calculator program in Python Language
# Simple Calculator in Python # Function for addition def add(x, y): return x + y # Function for subtraction def subtract(x, y): return x - y # Function for multiplication def multiply(x, y): return x * y # Function for division def divide(x, y): return x / y # Display the menu print("Select operation.") print("1.Add") print("2.Subtract") print("3.Multiply") print("4.Divide") # User input for choice choice = input("Enter choice(1/2/3/4): ") # User input for numbers num1 = int(input("Enter first number: ")) num2 = int(input("Enter second number: ")) # Conditional statements for operations 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")