From Newsgroup: comp.lang.c

Bart <bc@freeuk.com> writes:

On 15/03/2026 22:54, Tim Rentsch wrote:

Bart <bc@freeuk.com> writes:

On 13/03/2026 11:58, Bart wrote:

[characterizing my earlier code as a finite state machine]

Ideally it would just have a loop. (In my languages, there is a
feature called 'doswitch',

I ported this (C version using 'goto') to my scripting language just
to see what it would look like:

https://github.com/sal55/langs/blob/master/tr.q

This doesn't use 'goto', nor conventional loops. However 'doswitch'
does loop.

An alternative method could use 'recase' (in C terms, jumping directly
to a case label). It's just goto 'under the hood', but much less
underhand than 'longjmp'.

Other ways of control flow include label pointers (also in some C
extensions).

None of these more elaborate control structures are needed. The
board display behavior can easily be expressed using conventional
control structures, in standard C:

void
show_board( unsigned height, unsigned width, unsigned cutoff ){
const int D = digits_width( cutoff );
const unsigned R = cutoff < height ? cutoff : height;
unsigned r = 0, c = 0;

while( r < R ){
unsigned v = r + c*height;
if( v < cutoff ) printf( " %*u", D, v+1 );
if( ++c >= width ) putchar( '\n' ), c = 0, r++;
}
}

Yes, but you'd prohibited many standard features including loops for
your challenge.

I was responding to a context where the prohibitions had already
been violated. I was simply pointing out that if those rules are
going to be ignored then there are easier ways to solve the problem
than importing exotic control structures from other languages.
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