Convert integer number to three digit

Question

I have an integer variable .if its 1-9 it only displays as "1" or "9", I'm looking to convert the variable to save as 3 digits, ie. "001", or "009", etc. any ideas? I am using C#,ASP.Net

What are you looking to convert it with? – MartW May 31 '12 at 11:21 — MartW, May 31 '12 at 11:21
You should use 'String' to store something like '001' – Nalaka526 May 31 '12 at 11:44 — Nalaka526, May 31 '12 at 11:44

score 30 · Accepted Answer · answered May 31 '12 at 11:44

30

use

int X = 9;

string PaddedResult = X.ToString().PadLeft (3, '0'); // results in 009

see MSDN references here and here.

answered May 31 '12 at 11:44

Yahia

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I prefer the readability of the format string but if you're doing it lots, I suspect this will be faster right? – LexyStardust May 31 '12 at 11:49
@LexyStardust it might be faster but I like it because the length of the string can be a variable (first parameter in the call to Pad...) which in turn makes it rather easy to configure... – Yahia May 31 '12 at 11:51
Sorry I meant that this solution would be faster - won't be all the funky lookups to FormatProviders that goes underneath Format(). – LexyStardust May 31 '12 at 11:55

score 20 · Answer 2 · answered May 31 '12 at 11:46

20

What about

var result = String.Format("{0:000}", X);
var result2 = X.ToString("000");

answered May 31 '12 at 11:46

Jürgen Steinblock

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score 6 · Answer 3 · answered Dec 17 '14 at 12:27

6

int i = 5;
string tVal=i.ToString("000");

answered Dec 17 '14 at 12:27

Mohan Gopi

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score 3 · Answer 4 · answered Jan 10 '18 at 16:07

From: https://learn.microsoft.com/en-us/dotnet/standard/base-types/standard-numeric-format-strings#DFormatString

The "D" (or decimal) format specifier converts a number to a string of decimal digits (0-9), prefixed by a minus sign if the number is negative.

The precision specifier indicates the minimum number of digits desired in the resulting string. If required, the number is padded with zeros to its left to produce the number of digits given by the precision specifier.

Like:

int value; 

value = 12345;
Console.WriteLine(value.ToString("D"));
// Displays 12345
Console.WriteLine(value.ToString("D8"));
// Displays 00012345

value = -12345;
Console.WriteLine(value.ToString("D"));
// Displays -12345
Console.WriteLine(value.ToString("D8"));
// Displays -00012345

Kishore Kumar · Answer 5 · 2012-05-31T12:23:18.280

0

int i = 5;
string retVal = i.ToString().PadLeft(3, '0');

edited May 31 '12 at 12:23

answered May 31 '12 at 12:00

Kishore Kumar

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score 0 · Answer 6 · answered Jul 07 '21 at 00:29

0

you can use this code also

int k = 5;
string name =  $"name-{k++:D3}.ext";

answered Jul 07 '21 at 00:29

hossein sedighian

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Convert integer number to three digit

6 Answers6