## Code-Only: int/long/double conversion to Spoken Numerics

/*
The below program works pretty well, but there are some
round-off precision errors in the double that are giving
me hell.  I may or may not look into it.  Ideally, if
given a string, I'd parse the string.  If given a number,
then and only then would I parse the number.  Since the
string representation of a double is quite relaxed, it
would actually be easier to parse.
*/

using System;

public class NumberToEnglish {
private static string[] onesMapping =
new string[] {
"Zero", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine",
"Ten", "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen"
};
private static string[] tensMapping =
new string[] {
"Twenty", "Thirty", "Fourty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety"
};
private static string[] groupMapping =
new string[] {
"Hundred", "Thousand", "Million", "Billion", "Trillion", "Quadrillion", "Quintillion", "Sextillian",
"Septillion", "Octillion", "Nonillion", "Decillion", "Undecillion", "Duodecillion", "Tredecillion",
"Quattuordecillion", "Quindecillion", "Sexdecillion", "Septendecillion", "Octodecillion", "Novemdecillion",
"Vigintillion", "Unvigintillion", "Duovigintillion", "10^72", "10^75", "10^78", "10^81", "10^84", "10^87",
"Vigintinonillion", "10^93", "10^96", "Duotrigintillion", "Trestrigintillion"
};

// NOTE: 10^303 is approaching the limits of double, as ~1.7e308 is where we are going
// 10^303 is a centillion and a 10^309 is a duocentillion

private static void Main(string[] args) {
double valToParse = double.Parse(args[0]);
Console.WriteLine(EnglishFromNumber(valToParse));
}

private static string EnglishFromNumber(int number) {
return EnglishFromNumber((long) number);
}

private static string EnglishFromNumber(long number) {
return EnglishFromNumber((double) number);
}

private static string EnglishFromNumber(double number) {
string sign = null;
if ( number < 0 ) {
sign = "Negative";
number = Math.Abs(number);
}

int decimalDigits = 0;
Console.WriteLine(number);
while(number < 1 || (number - Math.Floor(number) > 1e-10)) {
number *= 10;
decimalDigits++;
}
Console.WriteLine("Total Decimal Digits: {0}", decimalDigits);

string decimalString = null;
while(decimalDigits-- > 0) {
int digit = (int) (number % 10); number /= 10;
decimalString = onesMapping[digit] + " " + decimalString;
}

string retVal = null;
int group = 0;
if ( number < 1 ) {
retVal = onesMapping[0];
} else {
while(number >= 1) {
int numberToProcess = (number >= 1e16) ? 0 : (int) (number % 1000);
number = number / 1000;

string groupDescription = ProcessGroup(numberToProcess);
if ( groupDescription != null ) {
if ( group > 0 ) {
retVal = groupMapping[group] + " " + retVal;
}
retVal = groupDescription + " " + retVal;
}

group++;
}
}

return String.Format("{0}{4}{1}{3}{2}",
sign,
retVal,
decimalString,
(decimalString != null) ? " Point " : "",
(sign != null) ? " " : "");
}

private static string ProcessGroup(int number) {
int tens = number % 100;
int hundreds = number / 100;

string retVal = null;
if ( hundreds > 0 ) {
retVal = onesMapping[hundreds] + " " + groupMapping[0];
}
if ( tens > 0 ) {
if ( tens < 20 ) {
retVal += ((retVal != null) ? " " : "") + onesMapping[tens];
} else {
int ones = tens % 10;
tens = (tens / 10) - 2; // 20's offset

retVal += ((retVal != null) ? " " : "") + tensMapping[tens];

if ( ones > 0 ) {
retVal += ((retVal != null) ? " " : "") + onesMapping[ones];
}
}
}

return retVal;
}
}

Published Wednesday, June 09, 2004 8:22 AM by Justin Rogers

Wednesday, June 09, 2004 2:25 PM by TrackBack

#### # A conversion from integer to long form english... I could write that ;-)

Thursday, June 10, 2004 6:02 AM by TrackBack

#### # A love little samples like this...

Thursday, May 29, 2008 10:59 PM by lypepusappy

#### # re: Code-Only: int/long/double conversion to Spoken Numerics

Wednesday, February 18, 2009 7:47 AM by Chu

#### # re: Code-Only: int/long/double conversion to Spoken Numerics

How about from integer to sound.

Wednesday, August 19, 2009 6:16 PM by Spreety

#### # re: Code-Only: int/long/double conversion to Spoken Numerics

Cool class. As a minor detail, a zero appears to cause an infinite loop.

To fix, added a few lines:

public static string EnglishFromNumber(double number)

{

string sign = null;

if (number == 0)

{

return "Zero";

}

if (number < 0)

{

sign = "Negative";

number = Math.Abs(number);

}

Monday, December 21, 2009 11:57 AM by KD

#### # re: Code-Only: int/long/double conversion to Spoken Numerics

Hi Justin,

The function and code snipped is cool one

Try 67621.694 and 67621.695 and see result

Is it rounding problems?

Monday, August 23, 2010 11:56 PM by Michael Ray

#### # re: Code-Only: int/long/double conversion to Spoken Numerics

Good post.  I like the results.

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#### # re: Code-Only: int/long/double conversion to Spoken Numerics

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#### # re: Code-Only: int/long/double conversion to Spoken Numerics

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#### # re: Code-Only: int/long/double conversion to Spoken Numerics

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#### # re: Code-Only: int/long/double conversion to Spoken Numerics

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#### # re: Code-Only: int/long/double conversion to Spoken Numerics

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#### # re: Code-Only: int/long/double conversion to Spoken Numerics

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#### # re: Code-Only: int/long/double conversion to Spoken Numerics

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#### # re: Code-Only: int/long/double conversion to Spoken Numerics

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#### # re: Code-Only: int/long/double conversion to Spoken Numerics

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#### # re: Code-Only: int/long/double conversion to Spoken Numerics

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Friday, May 25, 2012 8:30 PM by matt

#### # re: Code-Only: int/long/double conversion to Spoken Numerics

Thanks so much. It's very useful for me.

Sunday, August 05, 2012 4:04 PM by Dexter Wright

#### # re: Code-Only: int/long/double conversion to Spoken Numerics

Fantastic snippet Justin! I think you can fix your "rounding" problems in about five minutes by simply changing your variable, "number", from a double to a decimal type, (and append an 'm' after literal assignments. You can't use double since some values simply don't exist for that type - cannot be represented in that type. Again, great job!

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#### # re: Code-Only: int/long/double conversion to Spoken Numerics

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#### # re: Code-Only: int/long/double conversion to Spoken Numerics

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#### # re: Code-Only: int/long/double conversion to Spoken Numerics

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#### # re: Code-Only: int/long/double conversion to Spoken Numerics

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#### # re: Code-Only: int/long/double conversion to Spoken Numerics

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#### # re: Code-Only: int/long/double conversion to Spoken Numerics

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#### # re: Code-Only: int/long/double conversion to Spoken Numerics

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