Positive negative or zero using sub

Positive, negative or zero using sub procedure.

DECLARE  SUB CHECK(N)
CLS
INPUT"ENTER ANY NUMBER";N
CALL CHECK(N)
END

SUB CHECK(N)
IF N>0 THEN
PRINT"THE GIVEN NO IS POSITIVE"
ELSEIF N<0 THEN
PRINT"THE GIVEN NO IS NEGATIVE"
ELSE
PRINT"THE GIVEN NO IS ZERO"
END IF
ENS SUB