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orcalc.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Ejemplo1 Calculadora</title>
<link href="res/css/bootstrap.min.css" rel="stylesheet">
<style>
body{
padding: 2em
}
.form-control{
display: inline-block;
width: auto;
}
.result{
margin-top: 1em;
}
</style>
</head>
<body>
<h1>le Calc</h1>
<div class="inputs">
<label for="var-a">Variable A</label>
<input type="text" id="var-a" class="form-control">
<select id="operator" class="form-control">
<option value="+">más</option>
<option value="-">menos</option>
<option value="*">por</option>
<option value="/">dividido por</option>
</select>
<label for="var-b">Variable B</label>
<input type="text" id="var-b" class="form-control">
<button id="calc" class="btn btn-primary">Calcular</button>
</div>
<div class="result">
<label>Resultado</label>
<input type="text" id="res" class="form-control" readonly>
</div>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<script>
var $calc = $('#calc'),
$varA = $('#var-a'),
$varB = $('#var-b'),
$operator = $('#operator'),
$res = $('#res');
function calculate(){
var op, a, b, result;
op = $operator.val();
a = parseInt( $varA.val() || 0 );
b = parseInt( $varB.val() || 0 );
if(op == '+'){
result = a + b
}else if(op == '-'){
result = a - b
}else if(op == '*'){
result = a * b
}else{
result = a / b
}
$res.val( result )
}
$calc.on('click', calculate)
</script>
</body>
</html>