How to create a Calculator in Python with Code

If you want to create a calculator in Python you can use this code.

Code for Creating Calculator in Python

To create a simple calculator in Python, you will need to use the following steps

1. Define a function that takes two numbers as arguments and returns the result of the desired operation.
2. Use a while loop to continuously prompt the user for input until they choose to exit the program.
3. Inside the while loop, use an if-elif-else statement to determine which operation the user wants to perform.
4. Call the appropriate function and print the result.

Here is an example of a simple calculator that can perform addition, subtraction, multiplication, and division:

def add(num1, num2):
  return num1 + num2

def subtract(num1, num2):
  return num1 - num2

def multiply(num1, num2):
  return num1 * num2

def divide(num1, num2):
  return num1 / num2

while True:
  print("Enter 1 to add, 2 to subtract, 3 to multiply, 4 to divide, or 0 to exit")
  choice = int(input())

  if choice == 0:
    break
  elif choice == 1:
    num1 = float(input("Enter the first number: "))
    num2 = float(input("Enter the second number: "))
    result = add(num1, num2)
  elif choice == 2:
    num1 = float(input("Enter the first number: "))
    num2 = float(input("Enter the second number: "))
    result = subtract(num1, num2)
  elif choice == 3:
    num1 = float(input("Enter the first number: "))
    num2 = float(input("Enter the second number: "))
    result = multiply(num1, num2)
  elif choice == 4:
    num1 = float(input("Enter the first number: "))
    num2 = float(input("Enter the second number: "))
    result = divide(num1, num2)
  else:
    print("Invalid choice")
    continue

  print("Result:", result)

This program will continuously prompt the user for input until they choose to exit. They can choose which operation to perform by entering a number between 0 and 4, and then entering the two numbers they want to perform the operation on. The program will then call the appropriate function and print the result.

Another Example of Creating a Calculator in Python

1. Define the functions for each of the basic operations (addition, subtraction, multiplication, and division).
2. Define a function to take in the operator and the two operands as arguments and perform the corresponding operation.
3. Define a function to take in user input and parse it to extract the operator and the operands.
4. Define the main function to run the calculator. This function should prompt the user for input, parse the input using the function defined in step 3, and then use the function defined in step 2 to perform the operation and print the result.

Here’s an example of how you could implement these steps:

def add(a, b):
    return a + b

def subtract(a, b):
    return a - b

def multiply(a, b):
    return a * b

def divide(a, b):
    return a / b

def calculate(operator, a, b):
    if operator == '+':
        return add(a, b)
    elif operator == '-':
        return subtract(a, b)
    elif operator == '*':
        return multiply(a, b)
    elif operator == '/':
        return divide(a, b)
    else:
        return "Invalid operator"

def parse_input(input_string):
    tokens = input_string.split()
    operator = tokens[0]
    a = int(tokens[1])
    b = int(tokens[2])
    return operator, a, b

def main():
    while True:
        input_string = input("Enter an operation (e.g. + 3 4): ")
        if input_string == 'q':
            break
        operator, a, b = parse_input(input_string)
        result = calculate(operator, a, b)
        print(result)

if __name__ == "__main__":
    main()

This calculator will prompt the user for input in the form “operator operand1 operand2”, e.g. “+ 3 4” to perform the addition operation. The user can enter ‘q’ to quit the calculator.

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