zero pad a double

[Ian T]

Hi

Does anyone know how to zero-pad a float or double? I know %02d works
for ints but it doesn't work for doubles e.g. 1.2 -01.2

Thanks

Ian

[Richard Heathfield]

Ian T said:

Hi

Does anyone know how to zero-pad a float or double? I know %02d works
for ints but it doesn't work for doubles e.g. 1.2 -01.2

It does if you do it right:

$ cat foo.c
#include <stdio.h>
#include <math.h>

int main(void)
{
double d = 1.2;
printf("%04.1f\n", d);
return 0;
}

$ ./foo
01.2

The figure just before the dot separator gives the total width of the
field, including the radix point and any post-radix digits.

--
Richard Heathfield
"Usenet is a strange place" - dmr 29/7/1999
http://www.cpax.org.uk
email: rjh at the above domain, - www.

[Ian T]

I see that now; total field width!

Works great now.

Thanks
Ian

Richard Heathfield wrote:

Ian T said:

>Hi

Does anyone know how to zero-pad a float or double? I know %02d works
for ints but it doesn't work for doubles e.g. 1.2 -01.2

It does if you do it right:

$ cat foo.c
#include <stdio.h>
#include <math.h>

int main(void)
{
double d = 1.2;
printf("%04.1f\n", d);
return 0;
}

$ ./foo
01.2

The figure just before the dot separator gives the total width of the
field, including the radix point and any post-radix digits.