Converting integer into formatted string

Question

How would I format an integer when I convert it to a string? For example:

NSString *date = [NSString stringWithFormat:
       @"...somestuff... %+02d00", ...., gmtOffset];

The above does not work properly. What I want is, for example, +0200 to appear. I should think that %+02d would convert my integer 2 into "+02". But it does no happen, I get "+2". Why is this? Am I doing something wrong or is some formatting not supported?

Adam · Accepted Answer · 2012-06-01 20:56:41Z

2

EDIT: I finally got it. Works for both positive and negative numbers and adds the leading zeros. Hope it helps.

NSString *str = [NSString stringWithFormat:@"%+03d00", 2];
NSLog(@"%@", str);

edited Jun 1, 2012 at 20:56

answered Jun 1, 2012 at 18:43

Adam

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4 Comments

Carelinkz Over a year ago

Well what if I want it to be -2? The + is supposed to force a + or - in front of the number, and this solution gets me "+-02"....

Adam Over a year ago

@radiopaque Edited my answer. It's not the cleanest code, but it works.

Adam Over a year ago

@radiopaque I've done some debugging and finally found the best answer. Hope it's what you've been looking for.

Carelinkz Over a year ago

Yes! It's a bit counter-intuitive (to me), but the sign counts as a character. So for two actual digits, plus a sign, you'd need THREE characters as in your answer. Thank you very much!

calimarkus · Accepted Answer · 2012-06-01 20:29:54Z

0

The documentation says, that there is a + as modifier. But I don't know how to exactly place/use it.

http://pubs.opengroup.org/onlinepubs/009695399/functions/printf.html

+ The result of a signed conversion shall always begin with a sign ( '+' or '-' ). The conversion shall begin with a sign only when a negative value is converted if this flag is not specified.

Link in apple documentation:
https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/Strings/Articles/formatSpecifiers.html

answered Jun 1, 2012 at 20:29

calimarkus

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1 Comment

Adam Over a year ago

I couldn't get this work. It does add the sign properly, but doesn't add the leading zeros. I'm curious if there is a solution for this.

self · Accepted Answer · 2012-06-01 21:09:32Z

0

Yes Adam is right:

  NSString *date = [NSString stringWithFormat:
                  @"%+03d00",2];
NSLog(@"date %@",date);

edited Jun 1, 2012 at 21:09

answered Jun 1, 2012 at 18:44

self

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1 Comment

self Over a year ago

Yes it's 3 decimal places and not 2

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