<!--

var NDIGITS = 16;
var STACKSIZE = 12;
var value = 0;
var level = 0;
var entered = true;
var decimal = 0;
var fixe = 0;
var exponent = false;
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 pousser(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;
}
function entrer()
{
if (level==0)
return false;
for (i=0;i<level; ++i)
{
stack[i].value = stack[i+1].value;
stack[i].op = stack[i+1].op;
stack[i].prec = stack[i+1].prec;
}
--level;
return true;
}
function format(value)
{
var valStr = "" + value;
if (valStr.indexOf("N")>=0 ||
(value == 2*value && value == 1+value))
return "Error ";
var i = valStr.indexOf("e")
if (i>=0)
{
var expStr = valStr.substring(i+1,valStr.length);
if (i>NDIGITS-5) i=NDIGITS-5;
valStr = valStr.substring(0,i);
if (valStr.indexOf(".")<0) valStr += ".";
valStr += " " + expStr;
} else {
var valNeg = false;
if (value < 0) { value = -value; valNeg = true; }
var expval = Math.log(value)*Math.LOG10E;
if (value == 0) {
expval = 0;
} else if (expval > NDIGITS-5) {
expval = Math.floor(expval);
value /= Math.pow(10, expval);
} else if (-expval > NDIGITS-5) {
expval = Math.ceil(expval);
value /= Math.pow(10, expval);
} else {
expval = 0;
}
var valInt = Math.floor(value);
var valFrac = value - valInt;
var prec = NDIGITS - (""+valInt).length - 1;
if (prec < 0) return "Error"
if (! entered && fixe>0)
prec = fixe;
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 || fixe==0)
{
while (i>=0 && fracStr.charAt(i)=="0")
--i;
fracStr = fracStr.substring(0,i+1);
}
if (i>=0) valStr += "." + fracStr;
if (expval != 0) {
var expStr = "" + expval;
valStr += " " + expStr;
}
}
return valStr;
}
function refresh()
{
var display = format(value);
if (exponent)
{
if (expval<0)
display += " " + expval;
else
display += " +" + expval;
}
if (display.indexOf(".")<0 && display != "Error ")
{
if (entered || decimal>0)
display += '.';
else
display += ' ';
}
display = " " + display;
display =
display.substring(display.length-NDIGITS-1,display.length);
document.calculator.result.value = display;
}
function clearDisp()
{
exponent = false;
value = 0;
enter();
refresh();
}
function clearAll()
{
level = 0;
clearDisp();
}
function evalx()
{
if (level==0)
return false;
op = stack[0].op;
sval = stack[0].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);
entrer();
if (op=='(')
return false;
return true;
}
function openp()
{
enter();
if (!pousser(0,'(',0))
value = "NAN";
refresh();
}
function closep()
{
enter();
while (evalx()) ;
refresh();
}
function operator(op)
{
enter();
if (op=='+' || op=='-')
prec = 1;
else if (op=='*' || op=='/')
prec = 2;
else if (op=="pow")
prec = 3;
if (level>0 && prec <= stack[0].prec)
evalx();
if (!pousser(value,op,prec))
value = "NAN";
refresh();
}
function enter()
{
if (exponent)
value = value * Math.exp(expval * Math.LN10);
entered = true;
exponent = false;
decimal = 0;
fixe = 0;
}
function equals()
{
enter()
while (level>0)
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);
++fixe;
}
else
value = value * 10 + n;
}
refresh();
}
function bksp()
{
if (entered)
{
refresh();
return;
}
if (digits==0)
{
refresh();
return;
}
if (exponent)
{
if (expval<0)
expval = -Math.floor(-expval/10);
else
expval = Math.floor(expval/10);
--digits;
refresh();
return;
}
if (decimal>1)
{
if (value<0)
value = -Math.floor(-value*decimal/10);
else
value = Math.floor(value*decimal/10);
decimal = decimal / 10;
value = value/decimal;
--fixe;
if (decimal == 1)
decimal = 0;
}
else
{
if (value<0)
value = -Math.floor(-value/10);
else
value = Math.floor(value/10);
decimal = 0;
}
--digits;
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 func(f)
{
enter();
if (f=="1/x")
{
value = 1/value;
}
else if (f=='n!')
{
if (value<0 || value>200 || value != Math.round(value))
value = "NAN";
else
{
var n = 1;
var i;
for (i=1;i<=value;++i)
n *= i;
value = n;
}
}
else
{
if (f=="sin")
value = Math.sin(value/180 * Math.PI);
else if (f=="cos")
value = Math.cos(value/180 * Math.PI);
else if (f=="tan")
value = Math.tan(value/180 * Math.PI);
else if (f=="log")
value = Math.log(value)/Math.LN10;
else if (f=="log2")
value = Math.log(value)/Math.LN2;
else if (f=="ln")
value = Math.log(value);
else if (f=="sqrt")
value = Math.sqrt(value);
else if (f=="pi")
value = Math.PI;
else if (f=="asin")
value = Math.asin(value)*180/Math.PI;
else if (f=="acos")
value = Math.acos(value)*180/Math.PI;
else if (f=="atan")
value = Math.atan(value)*180/Math.PI;
else if (f=="alog")
value = Math.exp(value * Math.LN10);
else if (f=="alog2")
value = Math.exp(value * Math.LN2);
else if (f=="exp")
value = Math.exp(value);
else if (f=="sqr")
value = value*value;
else if (f=="e")
value = Math.E;
}
refresh();
}
// -->