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index.html
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<html>
<head>
<title>Calculadora</title>
<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css" integrity="sha384-PsH8R72JQ3SOdhVi3uxftmaW6Vc51MKb0q5P2rRUpPvrszuE4W1povHYgTpBfshb" crossorigin="anonymous">
<style>
.calculadora {
margin-top: 40px;
border: solid 1px #000;
padding: 20px;
background-color: #2E2E2E;
border-radius: 10px;
box-shadow: 1px 1px 5px #000;
}
.btn {
width: 60px;
height: 50px;
margin: 5px;
box-shadow: 1px 1px 1px #000;
}
.clear {
width: 130px;
}
.enter {
height: 110px;
}
.zero {
width: 130px;
}
.resultado {
text-align: right;
font-size: 20px;
margin-top: 10px;
margin-bottom: 20px;
border: solid 1px #000;
box-shadow: 1px 1px 1px #000;
}
</style>
</head>
<body style="background: #D9D9D9">
<div class="container">
<div class="row">
<div class="col d-flex justify-content-center">
<br />
<div class="calculadora">
<input id="resultado" type="text" class="form-control resultado" placeholder="0" disabled="disabled" />
<div class="row">
<button onclick="calcular('acao', 'c')" type="button" class="btn btn-dark btn-lg clear font-weight-light">C</button>
<button onclick="calcular('acao', '/')" type="button" class="btn btn-dark btn-lg font-weight-light">/</button>
<button onclick="calcular('acao', '*')" type="button" class="btn btn-dark btn-lg font-weight-light">x</button>
</div>
<div class="row">
<button onclick="calcular('valor', '7')" type="button" class="btn btn-dark btn-lg font-weight-light">7</button>
<button onclick="calcular('valor', '8')" type="button" class="btn btn-dark btn-lg font-weight-light">8</button>
<button onclick="calcular('valor', '9')" type="button" class="btn btn-dark btn-lg font-weight-light">9</button>
<button onclick="calcular('acao', '-')" type="button" class="btn btn-dark btn-lg font-weight-light">-</button>
</div>
<div class="row">
<button onclick="calcular('valor', '4')" type="button" class="btn btn-dark btn-lg font-weight-light">4</button>
<button onclick="calcular('valor', '5')" type="button" class="btn btn-dark btn-lg font-weight-light">5</button>
<button onclick="calcular('valor', '6')" type="button" class="btn btn-dark btn-lg font-weight-light">6</button>
<button onclick="calcular('acao', '+')" type="button" class="btn btn-dark btn-lg font-weight-light">+</button>
</div>
<div class="row">
<button onclick="calcular('valor', '1')" type="button" class="btn btn-dark btn-lg font-weight-light">1</button>
<button onclick="calcular('valor', '2')" type="button" class="btn btn-dark btn-lg font-weight-light">2</button>
<button onclick="calcular('valor', '3')" type="button" class="btn btn-dark btn-lg font-weight-light">3</button>
<button onclick="calcular('acao', '=')"type="button" class="btn btn-dark btn-lg enter">=</button>
</div>
<div class="row" style="margin-top: -60px">
<button onclick="calcular('valor', '0')" type="button" class="btn btn-dark zero btn-lg font-weight-light">0</button>
<button onclick="calcular('acao', '.')" type="button" class="btn btn-dark btn-lg font-weight-light">.</button>
</div>
</div>
</div>
</div>
</div>
<script>
function calcular(tipo, valor) {
if(tipo === 'acao') {
if(valor === 'c') {
// limpar o visor(id resultado)
document.getElementById('resultado').value = ''
}
if( valor === '+' || valor === '-' || valor === '*' || valor === '/' || valor === '.') {
document.getElementById('resultado').value += valor
}
if( valor === '=') {
var valor_campo = eval(document.getElementById('resultado').value)
document.getElementById('resultado').value = valor_campo
}
} else if(tipo === 'valor') {
document.getElementById('resultado').value += valor
}
}
</script>
</body>
</html>