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simpleCalculator.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Simple Calculator</title>
</head>
<body>
<div id="wrapper">
<input type="text" placeholder="Enter First Number">
<input type="text" placeholder="Enter Second Number">
<select name="" id="">
<option value="" selected disabled>Select Operation</option>
<option value="+">Add</option>
<option value="-">Minus</option>
<option value="*">Multiply</option>
<option value="/">Divide</option>
<option value="%">Modulus</option>
</select>
<button>Operate</button>
<p></p>
</div>
<script>
const input1 = document.querySelector("input:first-of-type")
const input2 = document.querySelector("input:last-of-type")
const select = document.querySelector("select")
const button = document.querySelector("button")
const para = document.querySelector("p")
button.onclick = () => {
switch (select.value) {
case "+":
para.innerHTML = Number(input1.value) + Number(input2.value)
break;
case "-":
para.innerHTML = Number(input1.value) - Number(input2.value)
break;
case "/":
para.innerHTML = Number(input1.value) / Number(input2.value)
break;
case "*":
para.innerHTML = Number(input1.value) * Number(input2.value)
break;
case "%":
para.innerHTML = Number(input1.value) % Number(input2.value)
break;
}
}
</script>
</body>
</html>