[fpc-pascal] Format(), leading zeros, and hex digits

[Michael Van Canneyt]

On Sat, 22 Feb 2014, Mark Morgan Lloyd wrote:

> Is it possible to get Format() to pad with leading zeros rather than spaces, 
> particularly in the case of hex numbers? My understanding is that printf() 
> interprets e.g. %02s as being padded with zeros.

For string arguments, this is not possible.
You can use %.2d for this, or %.2x for hex numbers:

araminta: >./tf
000F
araminta: >cat tf.pp
uses sysutils;

begin
   writeln(format('%.4x',[15]));
end.

>
> In a similar vein, am I correct in understanding that FPC's Format() doesn't 
> allow the case to be controlled in hex output? C's printf() distinguishes 
> between %x and %X for case control.

You are correct in your understanding.

Michael.