Study the following pseudocode for a recursive function.
FUNCTION Unknown(BYVAL X, BYVAL Y : INTEGER) RETURNS INTEGER
IF X < Y THEN
OUTPUT X + Y
RETURN (Unknown(X + 1, Y) * 2)
ELSE
IF X = Y THEN
RETURN 1
ELSE
OUTPUT X + Y
RETURN (Unknown(X - 1, Y) DIV 2)
ENDIF
ENDIF
ENDFUNCTION
The operator DIV returns the integer value after division e.g. 13 DIV 2 would give 6
(a) Write program code to declare the function Unknown()