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Offers a extremely high precision level to make mathematical operations. For integers there is no limits and for floating point numbers, the class allows setting the maximum precision.
Created: 2006.05.03 - Modified 2009.07.16

//+ Jonas Raoni Soares Silva
//@ http://jsfromhell.com/classes/bignumber [rev. #4]

BigNumber = function(n, p, r){
    var o = this, i;
    if(n instanceof BigNumber){
        for(i in {precision: 0, roundType: 0, _s: 0, _f: 0}) o[i] = n[i];
        o._d = n._d.slice();
        return;
    }
    o.precision = isNaN(p = Math.abs(p)) ? BigNumber.defaultPrecision : p;
    o.roundType = isNaN(r = Math.abs(r)) ? BigNumber.defaultRoundType : r;
    o._s = (n += "").charAt(0) == "-";
    o._f = ((n = n.replace(/[^\d.]/g, "").split(".", 2))[0] = n[0].replace(/^0+/, "") || "0").length;
    for(i = (n = o._d = (n.join("") || "0").split("")).length; i; n[--i] = +n[i]);
    o.round();
};
with({$: BigNumber, o: BigNumber.prototype}){
    $.ROUND_HALF_EVEN = ($.ROUND_HALF_DOWN = ($.ROUND_HALF_UP = ($.ROUND_FLOOR = ($.ROUND_CEIL = ($.ROUND_DOWN = ($.ROUND_UP = 0) + 1) + 1) + 1) + 1) + 1) + 1;
    $.defaultPrecision = 40;
    $.defaultRoundType = $.ROUND_HALF_UP;
    o.add = function(n){
        if(this._s != (n = new BigNumber(n))._s)
            return n._s ^= 1, this.subtract(n);
        var o = new BigNumber(this), a = o._d, b = n._d, la = o._f,
        lb = n._f, n = Math.max(la, lb), i, r;
        la != lb && ((lb = la - lb) > 0 ? o._zeroes(b, lb, 1) : o._zeroes(a, -lb, 1));
        i = (la = a.length) == (lb = b.length) ? a.length : ((lb = la - lb) > 0 ? o._zeroes(b, lb) : o._zeroes(a, -lb)).length;
        for(r = 0; i; r = (a[--i] = a[i] + b[i] + r) / 10 >>> 0, a[i] %= 10);
        return r && ++n && a.unshift(r), o._f = n, o.round();
    };
    o.subtract = function(n){
        if(this._s != (n = new BigNumber(n))._s)
            return n._s ^= 1, this.add(n);
        var o = new BigNumber(this), c = o.abs().compare(n.abs()) + 1, a = c ? o : n, b = c ? n : o, la = a._f, lb = b._f, d = la, i, j;
        a = a._d, b = b._d, la != lb && ((lb = la - lb) > 0 ? o._zeroes(b, lb, 1) : o._zeroes(a, -lb, 1));
        for(i = (la = a.length) == (lb = b.length) ? a.length : ((lb = la - lb) > 0 ? o._zeroes(b, lb) : o._zeroes(a, -lb)).length; i;){
            if(a[--i] < b[i]){
                for(j = i; j && !a[--j]; a[j] = 9);
                --a[j], a[i] += 10;
            }
            b[i] = a[i] - b[i];
        }
        return c || (o._s ^= 1), o._f = d, o._d = b, o.round();
    };
    o.multiply = function(n){
        var o = new BigNumber(this), r = o._d.length >= (n = new BigNumber(n))._d.length, a = (r ? o : n)._d,
        b = (r ? n : o)._d, la = a.length, lb = b.length, x = new BigNumber, i, j, s;
        for(i = lb; i; r && s.unshift(r), x.set(x.add(new BigNumber(s.join("")))))
            for(s = (new Array(lb - --i)).join("0").split(""), r = 0, j = la; j; r += a[--j] * b[i], s.unshift(r % 10), r = (r / 10) >>> 0);
        return o._s = o._s != n._s, o._f = ((r = la + lb - o._f - n._f) >= (j = (o._d = x._d).length) ? this._zeroes(o._d, r - j + 1, 1).length : j) - r, o.round();
    };
    o.divide = function(n){
        if((n = new BigNumber(n)) == "0")
            throw new Error("Division by 0");
        else if(this == "0")
            return new BigNumber;
        var o = new BigNumber(this), a = o._d, b = n._d, la = a.length - o._f,
        lb = b.length - n._f, r = new BigNumber, i = 0, j, s, l, f = 1, c = 0, e = 0;
        r._s = o._s != n._s, r.precision = Math.max(o.precision, n.precision),
        r._f = +r._d.pop(), la != lb && o._zeroes(la > lb ? b : a, Math.abs(la - lb));
        n._f = b.length, b = n, b._s = false, b = b.round();
        for(n = new BigNumber; a[0] == "0"; a.shift());
        out:
        do{
            for(l = c = 0, n == "0" && (n._d = [], n._f = 0); i < a.length && n.compare(b) == -1; ++i){
                (l = i + 1 == a.length, (!f && ++c > 1 || (e = l && n == "0" && a[i] == "0")))
                && (r._f == r._d.length && ++r._f, r._d.push(0));
                (a[i] == "0" && n == "0") || (n._d.push(a[i]), ++n._f);
                if(e)
                    break out;
                if((l && n.compare(b) == -1 && (r._f == r._d.length && ++r._f, 1)) || (l = 0))
                    while(r._d.push(0), n._d.push(0), ++n._f, n.compare(b) == -1);
            }
            if(f = 0, n.compare(b) == -1 && !(l = 0))
                while(l ? r._d.push(0) : l = 1, n._d.push(0), ++n._f, n.compare(b) == -1);
            for(s = new BigNumber, j = 0; n.compare(y = s.add(b)) + 1 && ++j; s.set(y));
            n.set(n.subtract(s)), !l && r._f == r._d.length && ++r._f, r._d.push(j);
        }
        while((i < a.length || n != "0") && (r._d.length - r._f) <= r.precision);
        return r.round();
    };
    o.mod = function(n){
        return this.subtract(this.divide(n).intPart().multiply(n));
    };
    o.pow = function(n){
        var o = new BigNumber(this), i;
        if((n = (new BigNumber(n)).intPart()) == 0) return o.set(1);
        for(i = Math.abs(n); --i; o.set(o.multiply(this)));
        return n < 0 ? o.set((new BigNumber(1)).divide(o)) : o;
    };
    o.set = function(n){
        return this.constructor(n), this;
    };
    o.compare = function(n){
        var a = this, la = this._f, b = new BigNumber(n), lb = b._f, r = [-1, 1], i, l;
        if(a._s != b._s)
            return a._s ? -1 : 1;
        if(la != lb)
            return r[(la > lb) ^ a._s];
        for(la = (a = a._d).length, lb = (b = b._d).length, i = -1, l = Math.min(la, lb); ++i < l;)
            if(a[i] != b[i])
                return r[(a[i] > b[i]) ^ a._s];
        return la != lb ? r[(la > lb) ^ a._s] : 0;
    };
    o.negate = function(){
        var n = new BigNumber(this); return n._s ^= 1, n;
    };
    o.abs = function(){
        var n = new BigNumber(this); return n._s = 0, n;
    };
    o.intPart = function(){
        return new BigNumber((this._s ? "-" : "") + (this._d.slice(0, this._f).join("") || "0"));
    };
    o.valueOf = o.toString = function(){
        var o = this;
        return (o._s ? "-" : "") + (o._d.slice(0, o._f).join("") || "0") + (o._f != o._d.length ? "." + o._d.slice(o._f).join("") : "");
    };
    o._zeroes = function(n, l, t){
        var s = ["push", "unshift"][t || 0];
        for(++l; --l;  n[s](0));
        return n;
    };
    o.round = function(){
        if("_rounding" in this) return this;
        var $ = BigNumber, r = this.roundType, b = this._d, d, p, n, x;
        for(this._rounding = true; this._f > 1 && !b[0]; --this._f, b.shift());
        for(d = this._f, p = this.precision + d, n = b[p]; b.length > d && !b[b.length -1]; b.pop());
        x = (this._s ? "-" : "") + (p - d ? "0." + this._zeroes([], p - d - 1).join("") : "") + 1;
        if(b.length > p){
            n && (r == $.DOWN ? false : r == $.UP ? true : r == $.CEIL ? !this._s
            : r == $.FLOOR ? this._s : r == $.HALF_UP ? n >= 5 : r == $.HALF_DOWN ? n > 5
            : r == $.HALF_EVEN ? n >= 5 && b[p - 1] & 1 : false) && this.add(x);
            b.splice(p, b.length - p);
        }
        return delete this._rounding, this;
    };
}

<script type="text/javascript">
//<![CDATA[

var a = new BigNumber("123456789012345678901234567890123456789"),
b = "999999999999999999999999999.9999999999999999999999",
c = new BigNumber("10"),
d = new BigNumber("-2"),
PI = new BigNumber(355, 100, BigNumber.ROUND_HALF_UP).divide(113);


document.write(
    "<strong>10 ^ -2 = </strong>" + c.pow(d) + "<br />",
    "<strong>PI constant (using precision = 100, mode = ROUND_HALF_UP) = </strong>" + PI + "<br />",
    "<strong>" + a + " * " + b + " = </strong>" + a.multiply(b)
);

//]]>
</script>

Constructor

BigNumber([number: Object = 0], [precision: Integer = BigNumber.defaultPrecision], [roundType: Integer = BigNumber.defaultRoundType])

Generates a new instance of BigNumber.

number

accepts string, number or BigNumber

precision

precision

roundType

rounding type

Rounding types

BigNumber.ROUND_HALF_EVEN

Rounds 5-9 to the nearest even number.

BigNumber.ROUND_HALF_DOWN

Rounds 0-5 to down.

BigNumber.ROUND_HALF_UP

Rounds 5-9 to up.

BigNumber.ROUND_FLOOR

Rounds towards to the lower (considerating the signal).

BigNumber.ROUND_CEIL

Rounds towards to the higher (considerating the signal).

BigNumber.ROUND_DOWN

Rounds towards to the the lower.

BigNumber.ROUND_UP

Rounds towards to the higher.

Class properties

BigNumber.defaultPrecision: Integer = 40

Precision that will be used by default.

BigNumber.defaultRoundType: Integer = BigNumber.ROUND_HALF_UP

Default rounding type.

Properties

BigNumber.precision: Integer

Specifies the max precision (amount of numbers after the floating point).

BigNumber.roundType: Integer

Indicates the rounding type that will be used when the number is higher than the precision

Methods

All the methods (except "set" and "round") that returns BigNumber, will return a new instance instead of the own object used in the calling.

BigNumber.set(n: Object): BigNumber

Sets the value of the object with the specified number.

n

accepts string, number or a BigNumber

BigNumber.add(n: Object): BigNumber

Does the sum.

n

accepts string, number or a BigNumber

BigNumber.subtract(n: Object): BigNumber

Does the subtration.

n

accepts string, number or a BigNumber

BigNumber.multiply(n: Object): BigNumber

Does the multiplication.

n

accepts string, number or a BigNumber

BigNumber.divide(n: Object): BigNumber

Does the division.

n

accepts string, number or a BigNumber

BigNumber.mod(n: Object): BigNumber

Does the division and returns the remainder.

n

accepts string, number or a BigNumber

BigNumber.pow(n: Object): BigNumber

Does the power.

n

accepts string, number or a BigNumber

BigNumber.compare(n: Object): BigNumber

Compares the numbers and returns -1 if "n" is higher, 0 if they are equal and 1 if "n" is lower.

n

accepts string, number or a BigNumber

BigNumber.negate(n: Object): BigNumber

Returns "-number".

n

accepts string, number or a BigNumber

BigNumber.abs(n: Object): BigNumber

Returns the modulus of the number.

n

accepts string, number or a BigNumber

BigNumber.intPart(n: Object): BigNumber

Returs the integer part of the number.

n

accepts string, number or a BigNumber

BigNumber.round(void): void

Forces the rounding of the number.

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