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GLOBAL
DECLARE Alive : INTEGER
ENDGLOBAL
CLASS Box
Value : INTEGER
OVERLOAD PROCEDURE NEW()
Alive <- Alive + 1
ENDPROCEDURE
OVERLOAD IMPLICIT PROCEDURE NEW(Number : INTEGER)
Value <- Number
Alive <- Alive + 1
ENDPROCEDURE
OVERLOAD PROCEDURE NEW(BYREF Other : Box)
Value <- Other.Value
Alive <- Alive + 1
ENDPROCEDURE
PROCEDURE DELETE()
Alive <- Alive - 1
ENDPROCEDURE
ENDCLASS
FUNCTION Read(Value : Box) RETURNS INTEGER
RETURN Value.Value
ENDFUNCTION
OVERLOAD FUNCTION Pick(Value : Box) RETURNS INTEGER
RETURN 100 + Value.Value
ENDFUNCTION
OVERLOAD FUNCTION Pick(Value : INTEGER) RETURNS INTEGER
RETURN 200 + Value
ENDFUNCTION
OVERLOAD FUNCTION Only(Value : Box) RETURNS INTEGER
RETURN Value.Value
ENDFUNCTION
OVERLOAD FUNCTION OPERATOR+(A : Box, B : Box) RETURNS INTEGER
RETURN A.Value + B.Value
ENDFUNCTION
OVERLOAD FUNCTION OPERATOR=(A : Box, B : Box) RETURNS BOOLEAN
RETURN A.Value = B.Value
ENDFUNCTION
FUNCTION Make() RETURNS Box
RETURN 9
ENDFUNCTION
PROCEDURE Exercise()
DECLARE B : Box
B <- 7
OUTPUT B.Value, ":", Read(8), ":", Pick(1), ":", Only(6), ":", B + 2
OUTPUT Read(Make())
CASE OF B
7 : OUTPUT TRUE
OTHERWISE : OUTPUT FALSE
ENDCASE
ENDPROCEDURE
FUNCTION Fail() RETURNS INTEGER
THROW
ENDFUNCTION
PROCEDURE Pair(Value : Box, Number : INTEGER)
ENDPROCEDURE
CALL Exercise()
OUTPUT Alive
TRY
CALL Pair(1, Fail())
CATCH
OUTPUT Alive
ENDTRY
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