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Editorial Team
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Asked: 2026-05-25T21:52:59+00:00

What would be the expected result from the following Objective C code? int intValue

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What would be the expected result from the following Objective C code?

int intValue = 1;
NSString *string = [NSString stringWithFormat:@"%+02d", intValue];

I thought the value of string would be “+01”, it turns out to be “+1”. Somehow “0” in format string “+01” is ignored. Change code to:

int intValue = 1;
NSString *string = [NSString stringWithFormat:@"%02d", intValue];

the value of string is now “01”. It does generate the leading “0”. However, if intValue is negative, as in:

int intValue = -1;
NSString *string = [NSString stringWithFormat:@"%02d", intValue];

the value of string becomes “-1”, not “-01”.

Did I miss anything? Or is this a known issue? What would be the recommended workaround?
Thanks in advance.

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1 Answer

  1. Editorial Team

    @Mark Byers is correct in his comment. Specifying '0' pads the significant digits with '0' with respect to the sign '+/-'. Instead of '0' use dot '.' which pads the significant digits with '0' irrespective of the sign.

    [... stringWithFormat:@"%+.2d", 1]; // Result is @"+01"
[... stringWithFormat:@"%.2d", -1]; // Result is @"-01"
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