<html>
<head>
<title>Kalkulator</title>
<meta charset="utf-8" />
<script>
function Calculator(operator)
{
var a = document.getElementById('a').value;
var b = document.getElementById('b').value;
switch(operator)
{
case '+':
var result = parseFloat(a) + parseFloat(b);
break;
case '-':
var result = parseFloat(a) - parseFloat(b);
break;
case 'x':
var result = parseFloat(a) * parseFloat(b);
break;
case '/':
var result = parseFloat(a) / parseFloat(b);
break;
}
document.getElementById('result').value = '= ' + result;
}
</script>
</head>
<body>
<form id="calculator">
<input type="text" id="a" placeholder="a" />
<input type="text" id="b" placeholder="b" />
<input type="text" id="result" placeholder="=" disabled="disabled" />
<button type="button" onclick="Calculator(this.innerHTML)">/</button>
</form>
</body>
</html>
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