CEIL determines the smallest integer value greater than or equal
to x, and assigns this value to the result.
>>-CEIL(x)-----------------------------------------------------><
- x
- Real expression.
The result has the mode, base, scale, and precision of x,
except when x is fixed-point with precision (p,q).
The precision of the result is then given by:
(min(N,max(p-q+1,1)),0)