Create a Calculator in Python with Free Codes

Index

Intro – Calculator in Python

Hello, Here we are going to create a Calculator in Python which is the basic project of Python. This Project Teaches you basic functions of mathematics like Addition, subtraction, multiplying, and Division.

Codes with Explanation

# Define a function for addition
def add(x, y):
    return x + y

• This defines a function named add that takes two arguments, x and y. Functions are reusable blocks of code that perform specific tasks.
• Inside the add function, the return statement sends back the sum of x and y. This value is used wherever the function is called.

# Define a function for subtraction
def subtract(x, y):
    return x - y

• This defines another function, subtract, which performs subtraction. It also takes two arguments x and y.
• Inside the subtract function, it returns the result of subtracting y from x.

# Define a function for multiplication
def multiply(x, y):
    return x * y

• This function is defined to multiply two numbers x and y.
• Returns the product of x and y.

# Define a function for division
def divide(x, y):
    # Check if the denominator is not zero to avoid division by zero error
    if y == 0:
        return "Cannot divide by zero!"
    else:
        return x / y

• Defines a divide function, which will handle division. Again, it takes two arguments.
• Checks if the second argument y is zero to avoid division by zero, which causes an error in Python.
• If y is zero, the function returns a message instead of attempting the division.
• If y is not zero, the code block following else will execute.
• Performs the division of x by y and returns the result.

# Display a simple menu for the user
print("Select operation:")
print("1. Add")
print("2. Subtract")
print("3. Multiply")
print("4. Divide")

• Prints a message to prompt the user to select an operation.
• Prints “1. Add” as part of the menu options for the user.
• Prints “2. Subtract” as another option.
• Prints “3. Multiply” as another option.
• Prints “4. Divide” as the final option in the menu.

# Take input from the user for the operation
choice = input("Enter choice(1/2/3/4): ")

• Takes the user’s choice (which operation they want to perform) as input. The input() function gets input from the user and returns it as a string.

More Programming Projects

# Take input from the user for the operation
choice = input("Enter choice(1/2/3/4): ")

• Takes the first number from the user and converts it into a float (a number with a decimal point) for calculations.
• Takes the second number from the user and converts it into a float.

if choice == '1':
    print(f"{num1} + {num2} = {add(num1, num2)}")
elif choice == '2':
    print(f"{num1} - {num2} = {subtract(num1, num2)}")
elif choice == '3':
    print(f"{num1} * {num2} = {multiply(num1, num2)}")
elif choice == '4':
    print(f"{num1} / {num2} = {divide(num1, num2)}")
else:
    print("Invalid input")

• Checks if the user’s choice is ‘1’ (Addition).
• Calls the add function with num1 and num2, and prints the result using an f-string (formatted string). This prints both the expression and the result.
• Checks if the user’s choice is ‘2’ (Subtraction).
• Calls the subtract function and prints the result in a similar way to addition.
• Checks if the user’s choice is ‘3’ (Multiplication).
• Calls the multiply function and prints the result.
• Checks if the user’s choice is ‘4’ (Division).
• Calls the divide function and prints the result.
• If the user enters something other than ‘1’, ‘2’, ‘3’, or ‘4’, the code inside else runs.
• Prints an error message indicating the input was not valid.

Complete Codes

# Simple Calculator in Python

# Define a function for addition
def add(x, y):
    return x + y

# Define a function for subtraction
def subtract(x, y):
    return x - y

# Define a function for multiplication
def multiply(x, y):
    return x * y

# Define a function for division
def divide(x, y):
    # Check if the denominator is not zero to avoid division by zero error
    if y == 0:
        return "Cannot divide by zero!"
    else:
        return x / y

# Display a simple menu for the user
print("Select operation:")
print("1. Add")
print("2. Subtract")
print("3. Multiply")
print("4. Divide")

# Take input from the user for the operation
choice = input("Enter choice(1/2/3/4): ")

# Take input from the user for two numbers to perform the calculation on
num1 = float(input("Enter first number: "))
num2 = float(input("Enter second number: "))

# Perform the chosen operation and display the result
if choice == '1':
    print(f"{num1} + {num2} = {add(num1, num2)}")
elif choice == '2':
    print(f"{num1} - {num2} = {subtract(num1, num2)}")
elif choice == '3':
    print(f"{num1} * {num2} = {multiply(num1, num2)}")
elif choice == '4':
    print(f"{num1} / {num2} = {divide(num1, num2)}")
else:
    print("Invalid input")