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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Calculator</title>
</head>
<body>
<h2>Enter two numbers</h2>
<form>
<label>Number 1 : </label>
<input type="text" id="number1"> <br>
<label>Number 2 : </label>
<input type="text" id="number2"> <br>
</form>
<button onclick="addTwoNumbers()">Add</button>
<button onclick="minusTwoNumbers()">Subtract</button>
<button onclick="multiplyTwoNumbers()">Multiply</button>
<button onclick="divideTwoNumbers()">Divide</button>

<p id="answer"></p>

<script>
function addTwoNumbers(){
num1 = parseInt(document.getElementById('number1').value);
num2 = parseInt(document.getElementById('number2').value);

// checking if the user entered valid numbers
if(!isNaN(num1) && !isNaN(num2)){
document.getElementById('answer').innerHTML = num1 + num2;
}
else{
document.getElementById('answer').innerHTML = 'Enter numbers';
}
}

function minusTwoNumbers(){
num1 = parseInt(document.getElementById('number1').value);
num2 = parseInt(document.getElementById('number2').value);

if(!isNaN(num1) && !isNaN(num2)){
document.getElementById('answer').innerHTML = num1 - num2;
}
else{
document.getElementById('answer').innerHTML = 'Enter numbers';
}
}

function multiplyTwoNumbers(){
num1 = parseInt(document.getElementById('number1').value);
num2 = parseInt(document.getElementById('number2').value);

if(!isNaN(num1) && !isNaN(num2)){
document.getElementById('answer').innerHTML = num1 * num2;
}
else{
document.getElementById('answer').innerHTML = 'Enter numbers';
}
}

function divideTwoNumbers(){
num1 = parseInt(document.getElementById('number1').value);
num2 = parseInt(document.getElementById('number2').value);

if(!isNaN(num1) && !isNaN(num2)){
document.getElementById('answer').innerHTML = num1 / num2;
}
else{
document.getElementById('answer').innerHTML = 'Enter numbers';
}
}
</script>
</body>
</html>

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