status.i4.v = swap_longwords_c(array.g.v, num_elements.i4.v)

	This routine swaps the high longword for the low longword in a
	long long or double precision real array.

	array		array to longword swap
	num_elements	number of elements in array

	This function returns ACNET status values as follows:

	OK			success
	CLIB_INVARG		invalid number of elements

	This function requires the following include files:


	Related functions:

	swap_words_c, swap_bytes_c, swab, swap_bytes_longword_c,

	C/C++ usage:

	int	status;
	int	num_elements = NUM_ELEMENTS;
	double	array[NUM_ELEMENTS];

	status = swap_longwords_c((void *) array,num_elements);