C+
C NAME:
C	ArrR4AddConstant
C PURPOSE:
C	Add constant to real*4 array
C CALLING SEQUENCE:
	subroutine ArrR4AddConstant(N,A,R,C)
C INPUTS:
C	N	integer		abs(N) = # elements
C				N < 0 skips bad values
C	A(*)	real		input array of abs(N) elements
C	R	real		scalar constant to be added to A
C OUTPUTS:
C	C(*)	real		output array A+R
C CALLS:
C	BadR4
C PROCEDURE:
C	Special case: if source=destination and const=0, then no action is taken
C SEE ALSO:
C	Array_Info
C-
	    integer	N
	    real	A(*)
	    real	R
	    real	C(*)

	bad = BadR4()

	iA = loc(A)
	iC = loc(C)
	if (iA .eq. IC .and. R .eq. 0.) return

	call ArrayLoc2(iA,iC,abs(N),4,I1,I2,I3)

	do I=I1,I2,I3
	    if (N .lt. 0 .and. A(I) .eq. bad) then
		C(I) = bad
	    else
		C(I) = A(I)+R
	    end if
	end do

	return
	end