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Asked: 2026-05-14T00:01:41+00:00

I have the following code that is meant to convert milliseconds into hours, mins

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I have the following code that is meant to convert milliseconds into hours, mins and seconds:

int hours = floor(rawtime / 3600000);

int mins = floor((rawtime % 3600000) / (1000 * 60));
int secs = floor(((rawtime % 3600000) % (1000 * 60)) / 1000);

NSLog(@"%d:%d:%d", hours, mins, secs);

NSString *hoursStr = [NSString stringWithFormat:@"%d", hours];
NSString *minsStr = [NSString stringWithFormat:@"%d", mins];
NSString *secsStr = [NSString stringWithFormat:@"%d", secs];

NSLog(@"%a:%a:%a", hoursStr, minsStr, secsStr);

Fairly straightforward. Rawtime is an int with value 1200. The output is like this:

0:0:1

0x1.3eaf003d9573p-962:0x1.7bd2003d3ebp-981:-0x1.26197p-698

Why is it that converting the ints to strings gives such wild numbers? I’ve tried using %i and %u and they made no difference. What is happening?

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1 Answer

  1. Editorial Team

    You have to use %@ as the conversion specifier for an NSString. Change your last line to:

    NSLog(@"%@:%@:%@", hoursStr, minsStr, secsStr);

    %a means something totally different. From the printf() man page:

    aA
    The double argument is rounded and converted to hexadecimal notation in the style

    [-]0xh.hhhp[+-]d

    where the number of digits after the hexadecimal-point character is equal to the precision specification.

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