Recursos Gratis Webmasters. Codigos Javascript, Applets Java, Tutoriales Para Webmasters

<script language=javascript>
 
 var NDIGITS = 16;
 var STACKSIZE = 12;
 
 var value = 0;		// current value in display
 var memory = GetCookie("CalcMemory");	// current value in memory
 if (!memory) memory = 0;
 var level = 0;		// no. of items on stack
 var entered = true;	// has value on display been 'entered'?
 var decimal = 0;		// multiplier when entering after decimal point
 var fixed = 0;		// force trailing zero display when entering decimals
 var exponent = false;	// currently entering exponent?
 var inverse = false;	// has the INV key been pressed?
 
 if (location.search)
 {
 	// pass in value through command line
 	value = location.search.substring(1,location.search.length);
 }
 
 function stackItem()
 {
 	this.value = 0;
 	this.op = "";
 }
 
 function array(length)
 {
 	this[0] = 0;
 	for (i=0; i<length; ++i)
 	{
 		this[i] = 0;
 		this[i] = new stackItem();
 	}
 	this.length = length;
 }
 
 stack = new array(STACKSIZE);
 
 function push(value,op,prec)
 {
 	if (level==STACKSIZE)
 		return false;
 	for (i=level;i>0; --i)
	{
		stack[i].value = stack[i-1].value;
		stack[i].op = stack[i-1].op;
		stack[i].prec = stack[i-1].prec;
	}
	stack[0].value = value;
	stack[0].op = op;
	stack[0].prec = prec;
	++level;
	return true;
}

var valInt = Math.floor(value);
 		var valFrac = value - valInt;
 		var prec = NDIGITS - (""+valInt).length - 1;	// how many digits available after period
 		if (! entered && fixed>0)
			prec = fixed;
		var mult = " 1000000000000000000".substring(1,prec+2);
		var frac = Math.floor(valFrac * mult + 0.5);

valInt = Math.floor(Math.floor(value * mult + .5) / mult);

if (valNeg)

valStr = "-" + valInt;

else

valStr = "" + valInt;

var fracStr = "00000000000000"+frac;
		fracStr = fracStr.substring(fracStr.length-prec, fracStr.length);
		i = fracStr.length-1;
		if (entered || fixed==0)
		{
			// remove trailing zeros unless fixed during entry.
			while (i>=0 && fracStr.charAt(i)=="0")
				--i;
			fracStr = fracStr.substring(0,i+1);
		}
		if (i>=0) valStr += "." + fracStr;
//		document.result.debugField.value = "prec "+prec+", mult "+mult+", frac "+frac;
	}
	return valStr;
}

function clearAll()
{
	level = 0;
	clear();
}

function clear()
{
	exponent = false;
	value = 0;
	enter();
	refresh();
}

function evalx()
{
	if (level==0)
		return false;
	op = stack[0].op;
	sval = stack[0].value;
//	alert("eval "+sval+op+value);
	if (op == "+")
		value = sval + value;
	else if (op == '-')
		value = sval - value;
	else if (op == '*')
		value = sval * value;
	else if (op == '/')
		value = sval / value;
	else if (op == 'pow')
		value = Math.pow(sval,value);
	pop();
	if (op=='(')
		return false;
	return true;
}

function openp()
{
	enter();
	if (!push(0,'(',0))
	{
		value = "NAN";
	}
	refresh();
}

function closep()
{
	enter();
	while (evalx())
		;
	refresh();
}

function digit(n)
{
	if (entered)
	{
		value = 0;
		digits = 0;
		entered = false;

}

if (n==0 && digits==0)

{

refresh();

return;

}

if (exponent)
	{
		if (expval<0)
 			n = -n;
 		if (digits < 3)
 		{
 			expval = expval * 10 + n;
 			++digits;
 			refresh();
 		}
 		return;
 	}
 	if (value<0)
 		n = -n;
 	if (digits < NDIGITS-1)
 	{
 		++digits;
 		if (decimal>0)
		{
			decimal = decimal * 10;
			value = value + (n/decimal);
			++fixed;
		}
		else
			value = value * 10 + n;
	}
	refresh();
}

function sign()
{
	if (exponent)
		expval = -expval;
	else
		value = -value;
	refresh();
}

function period()
{
	if (entered)
	{
		value = 0;
		digits = 1;
	}
	entered = false;
	if (decimal == 0)
	{
		decimal = 1;
	}
	refresh();
}

function exp()
{
	if (entered || exponent)
		return;
	exponent = true;
	expval = 0;
	digits = 0;
	decimal = 0;
	refresh();
}

function inv()
{
	inverse = !inverse;
}

function getCookieVal (offset) {
  var endstr = document.cookie.indexOf (";", offset);
  if (endstr == -1)
    endstr = document.cookie.length;
  return unescape(document.cookie.substring(offset, endstr));
}

function DeleteCookie (name) {
  var exp = new Date();
  exp.setTime (exp.getTime() - 1);  // This cookie is history
  var cval = GetCookie (name);
  document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString();
}

//
// End of cookie functions
//////////

// -->
</script>

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