//----------------------------------------------------------------
//	comb.c
//
//	This file uses recursion to define a function that gives
//	the number of m-element subsets of an n-element set.  It
//	will be used to illustrate the steps which are needed to 
//	build a Shared Library in the Linux environment.
//
//	compile using:	$ gcc -c -fPIC comb.c
//
//	Here the -fPIC option instructs the compiler to generate
//	Position Independent Code, so that the resulting object-
//	code can be loaded into memory at an arbitrary address.
//
//	Also, if desired, the resulting object-file 'comb.o' can
//	be combined with other object-files into a single shared 
//	library, using the command-syntax:
//
//	$ gcc -shared -fPIC -o libcomb.so comb.o other.o
//
//
//	REFERENCES:
//
//	Mitchell, Oldham & Samuel, "Advanced Linux Programming"
//	(New Riders, 2001), pp. 36-43.
//
//	Johnson and Troan, "Linux Application Development"
//	(Addison-Wesley, 1998), pp. 69-77.
//
//	
//	programmer: ALLAN CRUSE
//	written on: 28 JUL 2002
//----------------------------------------------------------------

unsigned int comb( int n, int m )
{
	if (( n < 0 )||( m < 0 )||( n < m )) return 0;
	if (( n == 0 )||( m == 0 )||( n == m )) return 1;
	return	comb( n-1, m-1 ) + comb( n-1, m );
}