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* The contects of this file is in the Public Domain.
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* Created by Gustav Hartivgsson.
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[CCode (cname = "V", cprefix = "v_")]
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namespace VQDR.Common {
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* Fast Numbers are a decimal representation of numbers in the form of
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* a normal integer value. All internal numbers are multiples of 1000, so the
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* there is room for two three decimal points.
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* Maths done on these numbers are done using standard integer operations, and
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* not floating point maths.
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* The decimal part of the FastNumber has a maximum of 3 decimals.
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* How the value is divided internally is as follows:
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* (base 10) [0 0 0 0 0 .... 0 | 0 0 0 ]
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* [non-decial part | decimal]
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* Fast Numbers are a decimal representanion of numbers in the folm of
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* a normal integer value. All internal nummbers are multiples of 1000, so the
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* there is room for two three decimal ponts.
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* Math done on these numbers are done using standard integer operations, and
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* not floating point math.
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[CCode (cname = "VFastNumber", cprefix = "v_fast_number_")]
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public struct FastNumber {
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/** Precision used to output values */
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public const int PRECISION_DIGITS = 2;
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/** Precision factor used to evaluate output */
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public const int PRECISION_FACTOR = 100;
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public const int MUL_FACTOR = PRECISION_FACTOR * 10;
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public long raw_number;
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public long leading_zeros;
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* I'm not happy using getters/setters in this struct...
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* But I tink it'll have to do for simplicity.
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public const long MUL_FACTOR = 1000;
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public long raw_number { public get; private set; }
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public long number {
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public get {return (this.raw_number / MUL_FACTOR);}
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this.raw_number = (MUL_FACTOR * value);
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* Initialises a FastNumber.
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* Note: Due to implementation details, you can't pass a decimal part that
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* is less than .1, as we are normalising decimal values to the
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* @param number The number that are to be set as the none-decimal part of
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* the number. Defaults to 0.
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* @param decimal The decimal part of the number. Defaults to 0.
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public FastNumber (long number = 0) {
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this.raw_number = (number * MUL_FACTOR);
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* Do a deep copy of a FastNumber.
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get {return raw_number / MUL_FACTOR;}
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set {raw_number = number * MUL_FACTOR;}
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public FastNumber (long val = 0) {
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public FastNumber.copy (FastNumber other) {
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this.raw_number = other.raw_number;
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* Initialises a FastNumber from a string.
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* Can be a decimal representation.
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public FastNumber.from_string (string str) {
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parse_raw_number (str);
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* Initialises a FastNumber with the internal representation of that number.
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public FastNumber.raw (long raw) {
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this.raw_number = raw;
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public FastNumber.from_float (double float_number) {
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// XXX Do we need a faster way of doing this?
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parse_raw_number (float_number.to_string ());
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* Add this to an other FastNumber.
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* var f1 = FastNumber (3); // f1 = 3
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* var f2 = FastNumber (2); // f2 = 2
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* var f3 = f1.add (f2); // f3 = 5
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* @return a newly initialised FastNumber.
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* @param other The other fast number you want to add to this value.
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public FastNumber add (FastNumber? other) {
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return FastNumber.copy (this);
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var v = FastNumber ();
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v.raw_number = (this.raw_number + other.raw_number);
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* Add this to an other FastNumber.
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* var f1 = FastNumber (3); // f1 = 3
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* var f2 = FastNumber (2); // f2 = 2
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* var f3 = f1.subtract (f2); // f3 = 1
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* @return a newly initialised FastNumber.
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* @param other The other fast number you want to subtract from this
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public FastNumber subtract (FastNumber? other) {
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return FastNumber.copy (this);
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var v = FastNumber ();
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v.raw_number = (this.raw_number - other.raw_number);
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* Multiply this FastNumber with another FastNumber.
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* var f1 = FastNumber (3); // f1 = 3
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* var f2 = FastNumber (2); // f2 = 2
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* var f3 = f1.multiply (f2); // f3 = 6
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* @return a newly initialised FastNumber.
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* @param other The value you want to multiply this value with.
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public FastNumber multiply (FastNumber? other) {
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if (other == null || other.raw_number == 0 || this.raw_number == 0) {
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return FastNumber ();
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var ret = FastNumber ();
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ret.raw_number = ((this.raw_number * other.raw_number) / MUL_FACTOR);
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* Divide this FastNumbers with another FastNumber.
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* var f1 = FastNumber (6); // f1 = 6
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* var f2 = FastNumber (2); // f2 = 2
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* var f3 = f1.multiply (f2); // f3 = 3
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* @return a newly initialised FastNumber.
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* @param other The value you want to multiply this value with.
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public FastNumber divide (FastNumber other) throws MathError {
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if (other.raw_number == 0) {
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throw new MathError.DIVIDE_BY_ZERO ("trying to divide by zero");
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var ret = FastNumber ();
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ret.raw_number = ((this.raw_number * MUL_FACTOR) / other.raw_number);
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[CCode (cname = "vqdr_common_fast_number_compare")]
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public long compare (FastNumber other) {
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return this.raw_number - other.raw_number;
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* Round up this FastNumber and returns a new FastNumber.
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* @return a rounded up FastNumber.
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public FastNumber round_up () {
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long decimal = raw_number % PRECISION_FACTOR;
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ret = FastNumber.raw (raw_number + PRECISION_FACTOR - decimal);
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ret = FastNumber.raw (raw_number - decimal);
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* Round up this FastNumber and returns a new FastNumber.
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* @return a rounded down FastNumber.
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public FastNumber round_down () {
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long decimal = raw_number % PRECISION_FACTOR;
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// Is this ever reached?
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ret = FastNumber.raw (raw_number - PRECISION_FACTOR - decimal);
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ret = FastNumber.raw (raw_number - decimal);
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* FastNumber to string.
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* @param decimal whether to return the decimal portion of the number in
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* the string. Default = false.
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public string to_string (bool decimal = false) {
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string ret_val = null;
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ret_val = (this.raw_number / MUL_FACTOR).to_string ();
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// Copy stuff so we don't accidentality stomp them.
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long _raw_number = this.raw_number;
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long _integer_part = (_raw_number / MUL_FACTOR);
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long _decimal_part = (_raw_number - (_integer_part * MUL_FACTOR));
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var strbldr = new GLib.StringBuilder ();
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// normalise the decimal part.
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// (XXX This is rather expensive, is there a better way of doing this?).
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if (_decimal_part != 0) {
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while ((_decimal_part % 10) == 0) {
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_decimal_part = _decimal_part / 10;
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strbldr.append (_integer_part.to_string ())
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for ( var i = this.leading_zeros ; i > 0 ; i--) {
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strbldr.append_c ('0');
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strbldr.append (_decimal_part.to_string ());
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ret_val = strbldr.str;
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public double to_float () {
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// XXX This probobly needs to something faster?
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return double.parse (this.to_string (true));
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public long to_int () {
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return (this.raw_number / MUL_FACTOR);
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* Check if two FastNumbers are equal.
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* @return true if this is equal to the other.
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* @return false if this is not equal to the other.
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public bool equals (FastNumber other) {
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return (this.raw_number == other.raw_number);
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[CCode (cname = "vqdr_common_fast_number_compare")]
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public static extern long static_compare (FastNumber a, FastNumber b);
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private void parse_raw_number (string str) {
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//debug (@"(parse_raw_number) str: $str");
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this.raw_number = parse_raw_number (str);
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private static long parse_raw_number (string str) {
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int i_of_dot = str.index_of_char ('.');
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if (i_of_dot >= 0) {
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// Get the decimal number from the string, if such a thing exists.
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if ((str.length - 1 > i_of_dot)) {
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var intr_str = (str + "000").substring (i_of_dot + 1);
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// count leading zeros.
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for (i = 0; intr_str.@get (i) == '0'; i++){}
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this.leading_zeros = i;
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// remove leading zeros
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intr_str = intr_str.substring (i);
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//debug (@"(parse_raw_number) Intermediate string: $intr_str");
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ret_val = long.parse (intr_str);
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ret_val = long.parse ((str + "000").substring (i_of_dot + 1));
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// debug (@"(parse_raw_number) i_of_dot: $i_of_dot, ret_val (decimal): $ret_val\n");
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// Normalise the digits.
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while (ret_val > MUL_FACTOR) {
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ret_val = ret_val / 10;
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// debug (@"(parse_raw_number) retval (loop): $ret_val");
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for (var i = leading_zeros; i > 0; i--) {
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ret_val = ret_val / 10;
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// debug (@"(parse_raw_number) retval (loop2): $ret_val");
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// debug (@"ret_val (normalised): $ret_val\n");
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// get integer number
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ret_val = ret_val + (long.parse (str.substring (0, i_of_dot))
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ret_val = ret_val + (long.parse ("0" + str.substring (0, i_of_dot))
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ret_val = (long.parse (str) * MUL_FACTOR);
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//debug (@"(parse_raw_number) ret_val (finished): $ret_val\n");
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this.raw_number = ret_val;
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ret_val = long.parse (str) * MUL_FACTOR;
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public FastNumber add (FastNumber? other) {
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return new FastNumber.copy (this);
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var v = new FastNumber (this.raw_number + other.raw_number);
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public FastNumber subtract (FastNumber? other) {
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return new FastNumber.copy (this);
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var v = new FastNumber (this.raw_number - other.raw_number);
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public FastNumber multiply (FastNumber? other) {
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if (other == null || other.raw_value == 0) {
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return new FastNumber ();
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return new FastNumber ((this.raw_number * other.raw_number) / MUL_FACTOR);
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public FastNumber divide (FastNumber? other) throws MathError {
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if (other.raw_number == 0) {
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throw new MathError.DIVIDE_BY_ZERO
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("FantNumber - trying to divide by zero");
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return new FastNumber ((this.raw_number * MUL_FACTOR) / other.raw_number);
added
removed
src/common/fast-number.vala
