How can I create a calculator in both JavaScript and Python?
Creating a calculator in JavaScript and Python involves defining the basic operations (addition, subtraction, multiplication, and division), setting up the user interface (for JavaScript), and taking user input (for Python).

Here's a simple implementation for both languages:

1. **JavaScript (HTML + JavaScript):**
```html
<!DOCTYPE html>
<html>
    <head>
        <title>Simple Calculator</title>
        <style>
        input[type=button] {
            width: 60px;
            height: 60px;
        }
        </style>
        <script>
        function add(x, y) {
            return x + y;
        }

        function subtract(x, y) {
            return x - y;
        }

        function multiply(x, y) {
            return x * y;
        }

        function divide(x, y) {
            return x / y;
        }

        function input(value) {
            document.getElementById('display').value += value;
        }

        function calculate() {
            const expression = document.getElementById('display').value;
            const result = eval(expression);
            document.getElementById('display').value = result;
        }

        function clearDisplay() {
            document.getElementById('display').value = '';
        }
        </script>
    </head>
    <body>
        <h1>Simple Calculator</h1>
        <input type=text id=display readonly>
        <br>
        <input type=button value=1 onclick=input('1')>
        <input type=button value=2 onclick=input('2')>
        <input type=button value=3 onclick=input('3')>
        <input type=button value=+ onclick=input('+')>
        <br>
        <input type=button value=4 onclick=input('4')>
        <input type=button value=5 onclick=input('5')>
        <input type=button value=6 onclick=input('6')>
        <input type=button value=- onclick=input('-')>
        <br>
        <input type=button value=7 onclick=input('7')>
        <input type=button value=8 onclick=input('8')>
        <input type=button value=9 onclick=input('9')>
        <input type=button value=* onclick=input('*')>
        <br>
        <input type=button value=0 onclick=input('0')>
        <input type=button value=C onclick=clearDisplay()>
        <input type=button value== onclick=calculate()>
        <input type=button value=/ onclick=input('/')>
    </body>
</html>
```
2. **Python:**
```python
def add(x, y):
    return x + y

def subtract(x, y):
    return x - y

def multiply(x, y):
    return x * y

def divide(x, y):
    return x / y

def calculator():
    print(Select operation:)
    print(1. Add)
    print(2. Subtract)
    print(3. Multiply)
    print(4. Divide)

    choice = input(Enter choice (1, 2, 3, 4): )

    num1 = float(input(Enter first number: ))
    num2 = float(input(Enter second number: ))

    if choice == '1':
        print(Result:, add(num1, num2))
    elif choice == '2':
        print(Result:, subtract(num1, num2))
    elif choice == '3':
        print(Result:, multiply(num1, num2))
    elif choice == '4':
        print(Result:, divide(num1, num2))
    else:
    print(Invalid input)

    if name == main:
    while True:
    calculator()
    keep_going = input(Do you want to continue? (yes or no): )
    if keep_going.lower() != yes:
    break
```

For the JavaScript calculator, save the HTML + JavaScript code in a file with an `.html` extension and open it in a web browser. The calculator will appear, and you can perform calculations using the buttons.

For the Python calculator, save the Python code in a file with a `.py` extension and run it using a Python interpreter (Python 3.x). The calculator will prompt you to choose an operation, input numbers, and display the result. To exit the calculator, enter no when prompted to continue.
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