Is there a way to put a variable inside a string formatting like %04d in C? So I can make it vary depending on the variable results?

Question

printf("%04d\n", vet[i]);

Is it possible to make something like "%0(x)d" so that the formatting can vary?

No. But you can construct the format string programmatically before (with `sprintf` for example). — Eugene Sh., Dec 18 '20 at 15:24
You can also have `printf("%0*d\n", width, vet[i]);` to have more control over the formatting. — Weather Vane, Dec 18 '20 at 15:30
In fact I take my first comment partially back. For the width specification (but not the general formatting) you can use th asterisk notation as in http://port70.net/~nsz/c/c11/n1570.html#7.21.6.1p5 (and the answer) — Eugene Sh., Dec 18 '20 at 15:32

score 1 · Answer 1 · answered Dec 18 '20 at 15:30

1

Yes:

printf( "%0*d\n", width, vet[i] );

Example:

#include <stdio.h>

int main( void )
{
  for ( int i = 1; i < 5; i++ )
  {
    printf( "%0*d\n", i, i );
  }

  return 0;
}

Output:

answered Dec 18 '20 at 15:30

John Bode

1 Answers1