Mutually recursive functions in C
Andrew Koenig
ark at alice.UUCP
Mon Feb 13 01:20:46 AEST 1989
In article <34823 at tut.cis.ohio-state.edu>, william at cis.ohio-state.edu (James H. Williamson) writes:
> Does C allow mutually recursive functions & if so
> what are the declaration mechanisms & could somebody
> give an example?
Here's a factorial function needlessly written as a pair of
mutually recursive functions:
In C Classic:
int fact(); /* not really necessary */
int tcaf();
int fact(n)
int n;
{
if (n <= 0)
return 1;
else
return n * tcaf (n-1);
}
int tcaf(n)
int n;
{
if (n <= 0)
return 1;
else
return n * fact (n-1);
}
In ANSI C:
int fact(int); /* not really necessary */
int tcaf(int);
int fact(int n)
{
if (n <= 0)
return 1;
else
return n * tcaf (n-1);
}
int tcaf(int n)
{
if (n <= 0)
return 1;
else
return n * fact (n-1);
}
--
--Andrew Koenig
ark at europa.att.com
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