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How does sprintf work ?

Posted on 2014-02-06
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Last Modified: 2014-02-06
sprintf(iso8601_buf,"%4.4d-%2.2d-%2.2d",usYear,usMon,usDay);

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usYear, usMon, and usDay are unsigned short.

Please explain the second argument of above sprintf ( ) in detail.
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Question by:naseeam
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jkr earned 350 total points
ID: 39840070
The format is like

%[precision].[max_len]d

(you could also think of that as '%[min_len].[max_len]d') with the above formatting an output string according to the ISO 1806 format (YYYY-MM-DD) that you specified in your other Q, thus ensuring that the three values that form the date are arranged exactly as

[4 digits year]-[2 digits month]-[2 digits day]

with the hyphens in betwee.
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by:jkr
ID: 39840072
Ooops, forgot - see also the detaild description at http://en.cppreference.com/w/c/io/fprintf
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Author Closing Comment

by:naseeam
ID: 39840199
extremely fast response time.  Thank you!
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