This class implements function which can be used in ICalculator to calculate value of first argument increased by 1(if there is no second argument) or by second argument.

You can find more information in comments below. Overrided methods can be found in corresponding base class or interface.

class CProcedureInc :public CProcedure
    {
    public:
        CVariable *Calculate(CVariable *parent, CVariable *args) override;
    
        CProcedureInc();
    };