Format an integer given an integer and the number of digits to use

Question

Given

int myNumber=6
int myDigits=4

how do I asssign

string myString = "0006"

I asssume it would use string.Format()

please show what you have tried and why it does not work. – Jonathan Alfaro Dec 11 '19 at 23:31 — Jonathan Alfaro, Dec 11 '19 at 23:31

score 1 · Accepted Answer · answered Dec 11 '19 at 23:31

1

You can do

string myString = 6.ToString().PadLeft(4, '0');

answered Dec 11 '19 at 23:31

T.S.

if the number is 10 then won't pad left result in a 5 digit number? – SmileyFtW Dec 11 '19 at 23:34
@SmileyFtW 10 will get you `0010`. "4" is total number of characters in the result – T.S. Dec 11 '19 at 23:36
Perfect... thank you – SmileyFtW Dec 11 '19 at 23:38
the result was for a return string and looks like this and appears to do what I need `return _seqnumber.ToString().PadLeft(_seqNumDigits,'0')` – SmileyFtW Dec 11 '19 at 23:45
@SmileyFtW Glad it worked for you. The reason whey they downvoted is because you have not done your research. Well, happens. This also works `10.ToString("D4")` – T.S. Dec 11 '19 at 23:47
Well, I had done *some* homework I found `Format` and `PadLeft`. I am just now trying to learn C# coming from VBA. I googled and what I found seemed to indicate `PadLeft` was not what I wanted even though it turned out to be exactly what I needed. I know how to do a quick test in VBA, but don't have that skill in C# just yet. Thank you for the answer. I upvoted your solution as it was indeed the answer. – SmileyFtW Dec 12 '19 at 15:55
No problem. If this answers, you should also accept this answer. Another way to do - old programmer way - if you have max 5 chars, and you can have 1 to 5 initial chars, just concatenate `"0000" + val`. Then substring 5 last chars. But .net makes it all easy for you. All this is already built-in – T.S. Dec 12 '19 at 16:12

1 Answers1