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<![CDATA[
<html>
<head>
<title>
JavaScript DESTINATION - P113
</title>
<script language="JavaScript">
<!--
function addChar(input, character)
{
if(input.value == null || input.value == "0")
input.value = character
else
input.value += character
}
function cos(form)
{ form.display.value = Math.cos(form.display.value); }
function sin(form)
{ form.display.value = Math.sin(form.display.value); }
function tan(form)
{ form.display.value = Math.tan(form.display.value); }
function sqrt(form)
{ form.display.value = Math.sqrt(form.display.value); }
function ln(form)
{ form.display.value = Math.log(form.display.value); }
function exp(form)
{ form.display.value = Math.exp(form.display.value); }
function sqrt(form)
{ form.display.value = Math.sqrt(form.display.value); }
function deleteChar(input)
{ input.value = input.value.substring(0, input.value.length - 1) }
function changeSign(input)
{
if(input.value.substring(0, 1) == "-")
input.value = input.value.substring(1, input.value.length)
else
input.value = "-" + input.value
}
function compute(form)
{ form.display.value = eval(form.display.value) }
function square(form)
{ form.display.value = eval(form.display.value) * eval(form.display.value) }
function checkNum(str)
{
for (var i = 0; i < str.length; i++) {
var ch = str.substring(i, i+1)
if (ch < "0" || ch > "9") {
if (ch != "/" && ch != "*" && ch != "+" && ch != "-" && ch != "."
&& ch != "(" && ch!= ")") {
alert("chybne cislo!")
return false
}
}
}
return true
}
// -->
</script>
</head>
<body>
<center>
<form>
<input name="display" value="0" size=25></td>
<br>
<input type="button" value=" exp " onClick="if (checkNum(this.form.display.value))
{ exp(this.form) }">
<input type="button" value=" 7 " onClick="addChar(this.form.display, '7')">
<input type="button" value=" 8 " onClick="addChar(this.form.display, '8')">
<input type="button" value=" 9 " onClick="addChar(this.form.display, '9')">
<input type="button" value=" / " onClick="addChar(this.form.display, '/')">
<br>
<input type="button" value=" ln " onClick="if (checkNum(this.form.display.value))
{ ln(this.form) }">
<input type="button" value=" 4 " onClick="addChar(this.form.display, '4')">
<input type="button" value=" 5 " onClick="addChar(this.form.display, '5')">
<input type="button" value=" 6 " onClick="addChar(this.form.display, '6')">
<input type="button" value=" * " onClick="addChar(this.form.display, '*')">
<br>
<input type="button" value=" sqrt " onClick="if (checkNum(this.form.display.value))
{ cos(this.form) }">
<input type="button" value=" 1 " onClick="addChar(this.form.display, '1')">
<input type="button" value=" 2 " onClick="addChar(this.form.display, '2')">
<input type="button" value=" 3 " onClick="addChar(this.form.display, '3')">
<input type="button" value=" - " onClick="addChar(this.form.display, '-')">
<br>
<input type="button" value=" sq " onClick="if (checkNum(this.form.display.value))
{ square(this.form) }">
<input type="button" value=" 0 " onClick="addChar(this.form.display, '0')">
<input type="button" value=" . " onClick="addChar(this.form.display, '.')">
<input type="button" value=" +/- " onClick="changeSign(this.form.display)">
<input type="button" value=" + " onClick="addChar(this.form.display, '+')">
<br>
<input type="button" value=" ( " onClick="addChar(this.form.display, '(')">
<input type="button" value=" cos " onClick="if (checkNum(this.form.display.value))
{ cos(this.form) }">
<input type="button" value=" sin " onClick="if (checkNum(this.form.display.value))
{ sin(this.form) }">
<input type="button" value=" tan " onClick="if (checkNum(this.form.display.value))
{ tan(this.form) }">
<input type="button" value=" ) " onClick="addChar(this.form.display, ')')">
<br>
<input type="button" value=" Clear " onClick="this.form.display.value = 0 ">
<input type="button" value=" Back Space " onClick="deleteChar(this.form.display)">
<input type="button" value=" Enter " name="enter" onClick="if (checkNum(this.form.display.value))
{ compute(this.form) }">
</form>
</body>
</html>
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