macros with parameters in MSC 5.0

[Alan J Rosenthal]

In article <11879 at brl-adm.ARPA> jbaker at ee.UCLA.EDU (Joe Baker) writes:
>#define ctl(c) ('c'&037)
...
>I have come up with some ugly fixes, but would like to know: what is
>the Right Way to do this?

how about
    #define ctl(c)((c) & 31)
and call it as
    ctl('a')

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