calc

<html lang="pl">
<html>
<head>
<meta charset="utf-8">
<script>
var s,a;
s=0;
function licz()
{
a=parseFloat(document.getElementById("pole").value);
s=s+a;
document.getElementById("wyniko").value=s;
}
function czysc()
{
document.getElementById("wyniko").value="";
document.getElementById("pole").value="";
s=0;
}
function a9()
{
document.getElementById("wyniko").value="9";
}
function a8()
{
document.getElementById("wyniko").value="8";

}
function a7()
{
document.getElementById("wyniko").value="7";
}
function a6()
{
document.getElementById("wyniko").value="6";
}
function a5()
{
document.getElementById("wyniko").value="5";
}
function a4()
{
document.getElementById("wyniko").value="4";
}
function a3()
{
document.getElementById("wyniko").value="3";
}
function a2()
{
document.getElementById("wyniko").value="2";
}
function a1()
{
document.getElementById("wyniko").value="1";
}
function a0()
{
document.getElementById("wyniko").value="";
}
</script>
</head>
<body>
<center>
<button onClick="licz()">Widok</button>
<button onClick="licz()">Edycja</button>
<button onClick="licz()">Pomoc</button>
<br>
<input type="text" id="wyniko"/>
<br>

<button onClick="a9()">9</button>
<button onClick="a8()">8</button>
<button onClick="a7()">7</button>
<br>
<button onClick="a6()">6</button>
<button onClick="a5()">5</button>
<button onClick="a4()">4</button>
<br>
<button onClick="a3()">3</button>
<button onClick="a2()">2</button>
<button onClick="a1()">1</button>
<br>
<button onClick="a0()">0</button>
<button onClick="licz()">=</button>
<button onClick="czysc()">C</button>
</body>
</html>