Basic calculator program using Python

In this program we will see how to accomplish the basic calculator functionalities of a calculator using a python program. Here we create individual functions to carry out the calculations and return the result. Also user input is accepted along with the choice of operator.

Example

# This function performs additiion
def add(a, b):
   return a + b
# This function performs subtraction
def subtract(a, b):
   return a - b
# This function performs multiplication
def multiply(a, b):
   return a * b
# This function performs division
def divide(a, b):
return a / b
print("Select an operation.")
print("+")
print("-")
print("*")
print("/")
# User input
choice = input("Enter operator to use:")
A = int(input("Enter first number: "))
B = int(input("Enter second number: "))
if choice == '+':
   print(A,"+",B,"=", add(A,B))
elif choice == '-':
   print(A,"-",B,"=", subtract(A,B))
elif choice == '*':
   print(A,"*",B,"=", multiply(A,B))
elif choice == '/':
   print(A,"/",B,"=", divide(A,B))
else:
print("Invalid input")

Output

Running the above code gives us the following result −

Select an operation.
+
-
*
/
Enter operator to use: -
Enter first number: 34
Enter second number: 20
34 - 20 = 14