Example 1: calculator in html
<!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>
<!--CSS File-->
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
display: flex;
justify-content: center;
align-items: center;
min-height: 100vh;
background: #fffbd5;
background: -webkit-linear-gradient(
to right,
#b20a2c,
#fffbd5
);
background: linear-gradient(
to right,
#b20a2c,
#fffbd5
);
}
.container-first {
position: relative;
background: #0b8000;
border-radius: 6px;
overflow: hidden;
z-index: 10;
}
.container-first .calculator {
position: relative;
display: grid;
}
.container-first .calculator .value {
grid-column: span 4;
height: 140px;
width: 300px;
border: none;
padding-left: 1em;
font-size: 2.5em;
color: gold;
}
.container-first .calculator span {
display: grid;
height: 4.5em;
font-weight: 900;
color: rgb(255, 255, 255);
text-align: center;
align-items: center;
font-size: 20px;
user-select: none;
border-bottom: 4px solid rgba(255, 255, 255, 0.07);
border-right: 4px solid rgba(255, 255, 255, 0.07);
}
input[type="text"] {
color: rgb(255, 136, 0);
background-color: rgb(156, 40, 40);
}
<body>
<div class="container-first">
<form name="val" class="calculator">
<input type="text" class="value" name="ans" />
<span onclick="document.val.ans.value+='4'">4</span>
<span onclick="document.val.ans.value+='5'">5</span>
<span onclick="document.val.ans.value+='6'">6</span>
<span onclick="document.val.ans.value =eval(document.val.ans.value)">
=
</span>
<span onclick="document.val.ans.value+='7'">7</span>
<span onclick="document.val.ans.value+='8'">8</span>
<span onclick="document.val.ans.value+='9'">9</span>
<span onclick="document.val.ans.value+='-'">-</span>
<span onclick="document.val.ans.value+='1'">1</span>
<span onclick="document.val.ans.value+='2'">2</span>
<span onclick="document.val.ans.value+='3'">3</span>
<span onclick="document.val.ans.value+='/'">/</span>
<span onclick="document.val.ans.value+='0'">0</span>
<span onclick="document.val.ans.value=''">C</span>
<span onclick="document.val.ans.value+='*'">*</span>
<span onclick="document.val.ans.value+='00'">00</span>
<span onclick="document.val.ans.value+='+'">+</span>
</form>
</div>
</body>
</html>
Example 2: What is the code for a calculator
<!DOCTYPE HTML>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Calculator Made by Sanjith </title>
<link href="https://fonts.googleapis.com/css?family=Inconsolata" rel="stylesheet">
<style>
* {
font-family: 'Inconsolata', monospace;
color: rgb(0, 0, 0);
}
body {
background: linear-gradient(to right, rgb(24, 184, 168), rgb(118, 190, 50));;
}
.container {
width: 320px;
background: linear-gradient(to right, rgb(173, 58, 173), rgb(184, 63, 26));;
margin: 120px auto;
}
table {
width: 100%;
border-color: #09646407;
background: linear-gradient(to right, rgb(184, 24, 37), rgb(78, 13, 230));;
}
td {
width: 25%;
border-color: rgba(0, 0, 0, 0.363);
}
button {
width: 100%;
height: 70px;
font-size: 24px;
background: linear-gradient(to right, rgb(151, 11, 151), rgb(190, 94, 50));;
border: none;
}
#inputLabel {
height: 120px;
font-size: 40px;
vertical-align: bottom;
text-align: right;
padding-right: 16px;
background: linear-gradient(to right, rgb(4, 65, 88), rgb(226, 68, 47));;
}
</style>
</head>
<body>
<div class="container">
<table border="1" cellspacing="0">
<tr>
<td colspan="4" id="inputLabel">0</td>
</tr>
<tr>
<td colspan="3"><button onclick="pushBtn(this);">AC</button></td>
<td><button onclick="pushBtn(this);">/</button></td>
</tr>
<tr>
<td><button onclick="pushBtn(this);">7</button></td>
<td><button onclick="pushBtn(this);">8</button></td>
<td><button onclick="pushBtn(this);">9</button></td>
<td><button onclick="pushBtn(this);">*</button></td>
</tr>
<tr>
<td><button onclick="pushBtn(this);">4</button></td>
<td><button onclick="pushBtn(this);">5</button></td>
<td><button onclick="pushBtn(this);">6</button></td>
<td><button onclick="pushBtn(this);">-</button></td>
</tr>
<tr>
<td><button onclick="pushBtn(this);">1</button></td>
<td><button onclick="pushBtn(this);">2</button></td>
<td><button onclick="pushBtn(this);">3</button></td>
<td><button onclick="pushBtn(this);">+</button></td>
</tr>
<tr>
<td colspan="2"><button onclick="pushBtn(this);">0</button></td>
<td><button onclick="pushBtn(this);">.</button></td>
<td><button onclick="pushBtn(this);">=</button></td>
</tr>
</table>
</div>
<script>
var inputLabel = document.getElementById('inputLabel');
function pushBtn(obj) {
var pushed = obj.innerHTML;
if (pushed == '=') {
inputLabel.innerHTML = eval(inputLabel.innerHTML);
} else if (pushed == 'AC') {
inputLabel.innerHTML = '0';
} else {
if (inputLabel.innerHTML == '0') {
inputLabel.innerHTML = pushed;
} else {
inputLabel.innerHTML += pushed;
}
}
}
</script>
</body>
</html>