Is it possible to pass an integer to a precision specifier for string

Question

I was wondering if it is possible to pass an integer as a precision specifier.

For example if

 static void ShouldBeTruncated( char * StringToCheck, int precision )
{
  (strlen( StringToCheck )>= precision) ? printf( "%.15s...", StringToCheck) : printf( "%s", StringToCheck)  ;
}

Is it even possible to replace %.15s with %.<<PRECISION GOES HERE >>s so the length of precision could be specified ? If it is possible, how to do it ?

printf("%*.*f\n",10,5,123.456); – vitalygolub Aug 17 '16 at 08:53 — vitalygolub, Aug 17 '16 at 08:53

Kerrek SB · Answer 1 · 2016-08-17T08:58:29.373

2

Yes, use * as the precision, which takes another int argument off the argument list (before the argument whose value is to be printed):

void prec_print(double d, int prec)
{ 
    printf("%.*f\n", prec, d);
}

(Similarly, the field width may be specified dynamically by using *, too: %*.*f, width, prec, val.)

edited Aug 17 '16 at 08:58

answered Aug 17 '16 at 08:52

Kerrek SB

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1

[Demo](https://ideone.com/TvPkdy) – Kerrek SB Aug 17 '16 at 08:57
Thanks your solution works like a charm – Adrian Grzywaczewski Aug 17 '16 at 08:58

Is it possible to pass an integer to a precision specifier for string

1 Answers1