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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>Basic Calculator</title>
<style>
/* Parent Container */
.parent {
display: flex;
justify-content: center; /* Center horizontally */
align-items: center; /* Center vertically */
height: 100vh; /* Full height of the screen */
background-color: lightgray;
}
/* Child Box */
.container {
width: 300px;
height: 450px;
border: 5px solid black; /* Border */
background-color: white;
border-radius: 10px; /* Optional */
}
.txt {
margin: 10px;
width: 270px;
height: 50px;
font-size: 40px;
text-align: right;
border: 5px solid rgb(28, 27, 27);
}
.box {
width: 50px;
height: 50px;
margin: 10px;
font-size: 30px;
border: 5px ridge rgb(28, 27, 27);
border-radius: 5px;
}
#op {
background-color: #e7ef0e;
}
#op:hover {
background-color: aliceblue;
}
h1 {
text-align: center;
}
</style>
</head>
<body>
<!-- Parent Div (for positioning) -->
<div class="parent">
<!-- Child Div (the actual content box) -->
<div class="container">
<h1> Basic Calculator </h1>
<input type="text" class="txt" id="display" readonly>
<button class="box">7</button>
<button class="box">8</button>
<button class="box">9</button>
<button class="box" id="op">X</button>
<button class="box">4</button>
<button class="box">5</button>
<button class="box">6</button>
<button class="box" id="op">-</button>
<button class="box">1</button>
<button class="box">2</button>
<button class="box">3</button>
<button class="box" id="op">+</button>
<button class="box">0</button>
<button class="box" id="op">C</button>
<button class="box" id="op" >/</button>
<button class="box" id="op">=</button>
</div>
</div>
<script language="javascript">
var buttons = document.getElementsByClassName("box");
var display = document.getElementById("display");
var currentInput = "";
function buttonClick() {
var value = this.innerText;
if (value === "=") {
try {
currentInput = eval(currentInput.replace("X", "*"));
display.value = currentInput;
} catch (e) {
display.value = "Error";
}
} else if ((value === "C")) {
currentInput = "";
display.value = currentInput;
}
else {
currentInput += value;
display.value = currentInput;
}
}
for (var i = 0; i < buttons.length; i++) {
buttons[i].addEventListener("click", buttonClick);
}
</script>
</body>
</html>
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