How to format integer as string with 2 digits?

Question

I would like to format an integer 9 to "09" and 25 to "25".

How can this be done?

[Custom Numeric Format Strings](https://msdn.microsoft.com/en-us/library/0c899ak8(v=vs.110).aspx) — Reza Aghaei, Dec 28 '15 at 17:24

Reza Aghaei · Answer 1 · 2019-10-03T05:18:23.890

18

You can use either of these options:

The "0" Custom Specifier

value.ToString("00")
String.Format("{0:00}", value)

The Decimal ("D") Standard Format Specifier

value.ToString("D2")
String.Format("{0:D2}", value)

For more information:

edited Oct 03 '19 at 05:18

answered Dec 28 '15 at 17:31

Reza Aghaei

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score 1 · Answer 2 · answered Dec 28 '15 at 21:38

If its just leading zero's that you want, you can use this:

value.tostring.padleft("0",2)

If you have 2 digits, say 25 for example, you will get "25" back....if you have just one digit, say 9 for example, you will get "09"....It is worth noting that this gives you a string back, and not an integer, so you may need to cast this later on in your code.

score 0 · Answer 3 · answered Sep 02 '21 at 14:48

String formate is the best way to do that. It's will only add leading zero for a single length. 9 to "09" and 25 to "25".

String.format("%02d", value)

Bonus: If you want to add multiple leading zero 9 to "0009" and 1000 to "1000". That's means you want a string for 4 indexes so the condition will be %04d.

String.format("%04d", value)

score -8 · Accepted Answer · answered Dec 28 '15 at 17:24

-8

I don't know the exact syntax. But in any language, it would look like this.

a = 9
aString =""

if a < 10 then 
  aString="0" + a 
else 
  aString = "" + a
end if

answered Dec 28 '15 at 17:24

durbnpoisn

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@user19127 : This is _**definiately not failsafe!**_ One should never use the `+` operator when concatenating strings with numbers. Use the `&` operator for proper AND failsafe concatenation. **See: http://stackoverflow.com/a/734631/3740093** – Visual Vincent Dec 28 '15 at 22:20

How to format integer as string with 2 digits?

4 Answers4