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calci.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">
<link rel="stylesheet" href="calci.css">
<title>Calculator</title>
</head>
<body>
<div class="container">
<div class="display">
<input id="screen" type="text" placeholder="0">
</div>
<div class="btns">
<div class="row">
<button id="ce" onclick="backspc()">CE</button>
<button onclick="fact()">x!</button>
<button class="btn">(</button>
<button class="btn">)</button>
<button class="btn">%</button>
<button id="ac" onclick="screen.value=''">AC</button>
</div>
<div class="row">
<button onclick="sin()">sin</button>
<button onclick="pi()">π</button>
<button class="btn">7</button>
<button class="btn">8</button>
<button class="btn">9</button>
<button class="btn">÷</button>
</div>
<div class="row">
<button onclick="cos()">cos</button>
<button onclick="log()">log</button>
<button class="btn">4</button>
<button class="btn">5</button>
<button class="btn">6</button>
<button class="btn">x</button>
</div>
<div class="row">
<button onclick="tan()">tan</button>
<button onclick="sqrt()">√</button>
<button class="btn">1</button>
<button class="btn">2</button>
<button class="btn">3</button>
<button class="btn">-</button>
</div>
<div class="row">
<button onclick="e()">e</button>
<button onclick="pow()">x <span style="position: relative; bottom: .4em; right: .1em;">y</span>
</button>
<button class="btn">0</button>
<button class="btn">.</button>
<button id="eval" onclick="screen.value=eval(screen.value)">=</button>
<button class="btn">+</button>
</div>
</div>
</div>
</body>
<script>
var screen = document.querySelector('#screen');
var btn = document.querySelectorAll('.btn');
/*============ For getting the value of btn, Here we use for loop ============*/
for (item of btn) {
item.addEventListener('click', (e) => {
btntext = e.target.innerText;
if (btntext == 'x') {
btntext = '*';
}
if (btntext == '÷') {
btntext = '/';
}
screen.value += btntext;
});
}
function sin() {
screen.value = Math.sin(screen.value);
}
function cos() {
screen.value = Math.cos(screen.value);
}
function tan() {
screen.value = Math.tan(screen.value);
}
function pow() {
screen.value = Math.pow(screen.value, 2);
}
function sqrt() {
screen.value = Math.sqrt(screen.value, 2);
}
function log() {
screen.value = Math.log(screen.value);
}
function pi() {
screen.value = 3.14159265359;
}
function e() {
screen.value = 2.71828182846;
}
function fact() {
var i, num, f;
f = 1
num = screen.value;
for (i = 1; i <= num; i++) {
f = f * i;
}
i = i - 1;
screen.value = f;
}
function backspc() {
screen.value = screen.value.substr(0, screen.value.length - 1);
}
</script>
</html>