calculadora
Example heading with h2 size
Example heading with h3 size
Following is sample java code.
int i = 10;
if(i>0){
System.out.println('positive');
}
```<!DOCTYPE html>
<html lang="pt">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Calculadora Científica</title>
<style>
body { text-align: center; font-family: Arial, sans-serif; }
.calculadora { display: inline-block; background: #333; padding: 20px; border-radius: 10px; }
.tela { width: 100%; height: 50px; font-size: 1.5em; text-align: right; }
button { width: 22%; height: 50px; font-size: 1.2em; margin: 5px; cursor: pointer; }
</style>
</head>
<body>
<h1>Calculadora Científica</h1>
<div class="calculadora">
<input type="text" id="tela" class="tela" disabled>
<br>
<button onclick="add('7')">7</button>
<button onclick="add('8')">8</button>
<button onclick="add('9')">9</button>
<button onclick="add('/')">/</button>
<button onclick="add('Math.sin(')">sin</button>
<br>
<button onclick="add('4')">4</button>
<button onclick="add('5')">5</button>
<button onclick="add('6')">6</button>
<button onclick="add('*')">*</button>
<button onclick="add('Math.cos(')">cos</button>
<br>
<button onclick="add('1')">1</button>
<button onclick="add('2')">2</button>
<button onclick="add('3')">3</button>
<button onclick="add('-')">-</button>
<button onclick="add('Math.tan(')">tan</button>
<br>
<button onclick="clearTela()">C</button>
<button onclick="add('0')">0</button>
<button onclick="calcular()">=</button>
<button onclick="add('+')">+</button>
<button onclick="add('Math.log10(')">log</button>
<br>
<button onclick="add('(')">(</button>
<button onclick="add(')')">)</button>
<button onclick="add('Math.sqrt(')">√</button>
<button onclick="add('**')">^</button>
</div>
<script>
function add(valor) {
document.getElementById('tela').value += valor;
}
function calcular() {
try {
document.getElementById('tela').value = eval(document.getElementById('tela').value);
} catch {
document.getElementById('tela').value = "Erro";
}
}
function clearTela() {
document.getElementById('tela').value = "";
}
</script>
</body>
</html>