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#ifndef INTEGER_H#define INTEGER_H// Abstract base class defining a limited interface for an Integer.// Currently this is only used to provide the exponent of an exponentiation// chain, and hence the only operation required is testing set bits.class Integer(){	public:		// Virtual destructor		~Integer()		{		}		// Test if the n-th bit (from least to most significant) is set in		// the current integer.		virtual bool testBit(int bit) = 0;}#endif // INTEGER_H