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calculadora.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>CALCULADORA</title>
<style>
*{
margin: 0;
padding: 0;
}
.fundo {
background-image: linear-gradient(45deg, black, crimson);
height: 100vh;
color: #ffffff;
font-family: 'Times New Roman', Times, serif;
text-align: center;
}
.calculadora {
position: absolute;
background-color: rgba(0, 0, 0, 0.5);
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
border-radius: 15px;
padding: 15px;
}
.botao {
width: 50px;
height: 50px;
font-size: 25px;
cursor: pointer;
background-color: rgb(31, 31, 31);
border: none;
color: #ffffff;
margin: 1px;
}
.botao:hover {
background-color: black;
}
#resultado {
width: 207px;
height: 30px;
background-color: #ffffff;
margin: 5px;
font-size: 25px;
color: black;
text-align: right;
padding: 5px;
}
</style>
</head>
<body>
<div class="fundo">
<h1>STRAIK BILIONS</h1>
<div class="calculadora">
<h1>Calculadora</h1>
<p id="resultado"></p>
<table id="teclado">
<tr>
<td><button class="botao" onclick="clean()">C</button></td>
<td><button class="botao" onclick="back()">X</button></td>
<td><button class="botao" onclick="insert('/')">/</button></td>
<td><button class="botao" onclick="insert('*')">*</button></td>
</tr>
<tr>
<td><button class="botao" onclick="insert('7')">7</button></td>
<td><button class="botao" onclick="insert('8')">8</button></td>
<td><button class="botao" onclick="insert('9')">9</button></td>
<td><button class="botao" onclick="insert('-')">-</button></td>
</tr>
<tr>
<td><button class="botao" onclick="insert('4')">4</button></td>
<td><button class="botao" onclick="insert('5')">5</button></td>
<td><button class="botao" onclick="insert('6')">6</button></td>
<td><button class="botao" onclick="insert('+')">+</button></td>
</tr>
<tr>
<td><button class="botao" onclick="insert('1')">1</button></td>
<td><button class="botao" onclick="insert('2')">2</button></td>
<td><button class="botao" onclick="insert('3')">3</button></td>
<td rowspan="2"><button class="botao" style="height: 106px;" onclick="calcular()">=</button></td>
</tr>
<tr>
<td colspan="2"><button class="botao" style="width: 106px;" onclick="insert('0')">0</button></td>
<td><button class="botao" onclick="insert('.')">.</button></td>
</tr>
</table>
</div>
</div>
<script>
function insert(num) {
let numero = document.getElementById('resultado').innerHTML;
document.getElementById('resultado').innerHTML = numero + num;
}
function clean() {
document.getElementById('resultado').innerHTML = "";
}
function back() {
let resultado = document.getElementById('resultado').innerHTML;
document.getElementById('resultado').innerHTML = resultado.substring(0, resultado.length - 1);
}
function calcular() {
let resultado = document.getElementById('resultado').innerHTML;
if(resultado) {
document.getElementById('resultado').innerHTML = eval(resultado);
} else {
document.getElementById('resultado').innerHTML = '???'
}
}
</script>
</body>
</html>