Calculator

Aim: Implement a program to make a simple calculator that can add, subtract, multiply and divide using functions.

Algorithm:

1.Start

2.Enter the two inputs x & y

3 Choose which operation

4.if addition call function add()

5.if subtraction call function sub()

6. if multiplication call function mul()

7. if division call function div()

8.stop

Function add():

Return x+y

Function sub():

Return x-y

Function mul():

Return x*y

Function div():

Return x/y

Program:

# define functions

def add(x, y):

   """This function adds two numbers"""

   return x + y

def subtract(x, y):

   """This function subtracts two numbers"""

   return x - y

def multiply(x, y):

   """This function multiplies two numbers"""

   return x * y

def divide(x, y):

   """This function divides two numbers"""

   return x / y

# take input from the user

print("Select operation.")

print("1.Add")

print("2.Subtract")

print("3.Multiply")

print("4.Divide")

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