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<!DOCTYPE html>
<html lang="pt-br">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Calculadora</title>
<link rel="stylesheet" href="calculadora.css">
</head>
<body>
<div class="fundo">
<h1 class="nome">Priscila Gianni</h1>
<div class="calculadora">
<h1>Calculadora</h1>
<p id="resultado">12</p>
<table>
<tr>
<td><button class="botao" onclick="clean()">C</button></td>
<td><button class="botao" onclick="back()"><</button></td>
<td><button class="botao" onclick="insert(/)">/</button></td>
<td><button class="botao" onclick="insert(*)">X</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="botao1" onclick="calcular()">=</button></td>
</tr>
<tr>
<td colspan="2"><button class="botao2" onclick="insert('0')">0</button></td>
<td><button class="botao" onclick="insert('.')">.</button></td>
</tr>
</table>
</div>
</div>
<script>
function insert(num)
{
var numero = document.getElementById('resultado').innerHTML;
document.getElementById('resultado').innerHTML = numero + num;
}
function clean(){
document.getElementById('resultado').innerHTML = "";
}
function back(){
var resultado = document.getElementById('resultado').innerHTML;
document.getElementById('resultado').innerHTML = resultado.substring(0, resultado.length -1);
}
function calcular(){
var resultado = document.getElementById('resultado').innerHTML;
if(resultado){
document.getElementById('resultado').innerHTML = eval(resultado);
}
else{
document.getElementById('resultado').innerHTML = "Nada..."
}
}
</script>
</body>
</html>