Python Program to Make a Simple Calculator

 By: Unknown    04:52  Python   No comments

            Source Code 

Input

# Program make a simple calculator
# that can add, subtract, multiply
# and divide using functions

# 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")

          OUT PUT 

 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

Explanation

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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