rstbit(byte_string.i1a.r, bit_number.i2.r)

	rstbit_c(byte_string.i1a.r, bit_number.i4.v)

	This routine clears a bit in a byte string.  'bit_number' must
	be an integer bit number ranging from 1 to 32767 with each bit
	being numbered in ascending order from right to left.

	byte_string	byte or array of bytes to clear (up to 4096 bytes)
	bit_number	bit number (starts at 1)

	This function requires the following include files:


	Related functions:

	setbit(_c), tstbit(_c), bit_field_circular_shift_c, icshft,
	bit_count_c, masked_off_bit_count_c

	C/C++ usage:

	char	byte_string[NUM_BYTES];
	int	bit_number = BIT_NUMBER;