C# - Convert Numbers to Text (Words)
Here is the C# program for converting numbers into words. The logic here is to reuse the same string as much as possible. If you look at the string array in the code, I have defined strones and strtens. Once we have that, we can parse the number and get the corresponding string and appending it to come up with the result.
I have given here the code to display the numbers upto 100,000. If you want more limit, you can keep extending the program.
Here are other useful links where you can find the same program in other programming languages:
Source Code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace CSN2W
{
class Program
{
static bool HelperConvertNumberToText(int num, out string buf)
{
string [] strones = {
"One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight",
"Nine", "Ten", "Eleven", "Twelve", "Thirteen", "Fourteen",
"Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen",
};
string [] strtens = {
"Ten", "Twenty", "Thirty", "Fourty", "Fifty", "Sixty",
"Seventy", "Eighty", "Ninety", "Hundred"
};
string result = "";
buf = "";
int single, tens, hundreds;
if(num > 1000)
return false;
hundreds = num / 100;
num = num - hundreds * 100;
if( num < 20)
{
tens = 0; // special case
single = num;
}
else
{
tens = num / 10;
num = num - tens * 10;
single = num;
}
result = "";
if(hundreds > 0)
{
result += strones[hundreds-1];
result += " Hundred ";
}
if(tens > 0)
{
result += strtens[tens - 1];
result += " ";
}
if(single > 0)
{
result += strones[single - 1];
result += " ";
}
buf = result;
return true;
}
static bool ConvertNumberToText(int num, out string result)
{
string tempString = "";
int thousands;
int temp;
result = "";
if(num < 0 || num > 100000)
{
System.Console.WriteLine(num + " \tNot Supported");
return false;
}
if( num == 0)
{
System.Console.WriteLine(num + " \tZero");
return false;
}
if(num < 1000)
{
HelperConvertNumberToText(num, out tempString);
result += tempString;
}
else
{
thousands = num / 1000;
temp = num - thousands * 1000;
HelperConvertNumberToText(thousands, out tempString);
result += tempString;
result += "Thousand ";
HelperConvertNumberToText(temp, out tempString);
result += tempString;
}
return true;
}
static void Main(string[] args)
{
string result;
int i, num;
int [] arrNum =
{
-1, 0, 5, 10, 15, 19, 20, 21, 25, 33, 49, 50, 72,
99, 100, 101, 117, 199, 200, 214, 517, 589, 999,
1000, 1010, 1018, 1200, 9890, 10119, 13535, 57019,
99999, 100000, 100001
};
for (i = 0; i < arrNum.Count(); i++)
{
num = arrNum[i];
if( ConvertNumberToText(num, out result) == true)
Console.WriteLine(num + "\t" + result);
}
}
}
}
Output
-1 Not Supported
0 Zero
5 Five
10 Ten
15 Fifteen
19 Nineteen
20 Twenty
21 Twenty One
25 Twenty Five
33 Thirty Three
49 Fourty Nine
50 Fifty
72 Seventy Two
99 Ninety Nine
100 One Hundred
101 One Hundred One
117 One Hundred Seventeen
199 One Hundred Ninety Nine
200 Two Hundred
214 Two Hundred Fourteen
517 Five Hundred Seventeen
589 Five Hundred Eighty Nine
999 Nine Hundred Ninety Nine
1000 One Thousand
1010 One Thousand Ten
1018 One Thousand Eighteen
1200 One Thousand Two Hundred
9890 Nine Thousand Eight Hundred Ninety
10119 Ten Thousand One Hundred Nineteen
13535 Thirteen Thousand Five Hundred Thirty Five
57019 Fifty Seven Thousand Nineteen
99999 Ninety Nine Thousand Nine Hundred Ninety Nine
100000 One Hundred Thousand
100001 Not Supported
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