Macro parameters getting substituted into strings

[John Gilmore]

ado at elsie.UUCP (Arthur David Olson) wrote:
> Here's an example (taken from "/usr/include/sys/ttychars.h") of how we coped
> with the problem here at elsie...
> 
> 	#if !defined __STDC__ && !defined __DECUS_CPP__
> 	#define	CTRL(c)	('c'&037)
> 	#else /* defined __STDC__  || defined __DECUS_CPP__ */
> 	#ifndef LETR_a
> 	#define LETR_a	'a'
> 	#define LETR_b	'b'
> 	#define LETR_c	'c'
>... 	#define LETR_y	'y'
> 	#define LETR_z	'z'
> 	#define LETR_A	'A'
> 	#define LETR_B	'B'
>... 	#define LETR_Z	'Z'
> 	#endif /* !LETR_a */
> 	#define CTRL(c)	((LETR_ ## c) & 037)
> 	#endif /* defined __STDC__  || defined __DECUS_CPP__ */

When I was 14 years old I wrote a program in an early BASIC (which
did not support characters at all, just numbers), that would mess around
with words (each character stored as a number) and print them out.
The printout routine looked like:

4000	if (i = 1) print "A";
4010	if (i = 2) print "B";
4020	if (i = 3) print "C";
4030	if (i = 4) print "D";
and so on...

I was hoping to never have to do that sort of thing again.
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