Question: . BinaryOperation . ( : 4 + 5 : 4 , 5 : ' + ' ) .

". BinaryOperation.(: ""4+5"": 4,5: '+')
.""int compute (void)""""void printresult (void)"" BinaryOperation. .
.4: AddBinaryOperationSubBinaryOperationMulBinaryOperationDivBinaryOperation.
.""BinaryEquationParser""""BinaryOperation parseBinaryOpString (String binOpString)""
.""4+5""( AddBinaryOperation)..
.""BinaryMain"".
.""4+5"".9.
. parseBinaryOpString BinaryEquationParser printresult .
: 7
-2( VariableArityMain.java PQ03-1)
. VariableArityOperation
.
.5(: )
.( arity ""4+5+2""""7*8*9""""""4+5*2"")"

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