#ifndef _operand__h#define _operand__hclass operand{protected:    float Exponent;    double Value;    char Sign;    char Variable;public:    operand(void);    operand(char X);    operand(double X);    operand(const operand &X);    float exponent(void);    void exponent(float X);    double value(void);    void value(double X);    char sign(void);    void sign(char X);    char variable(void);    void variable(char X);    operand &operator+(const operand &X);    operand &operator-(const operand &X);    operand &operator*(const operand &X);    operand &operator/(const operand &X);    operand &operator=(const operand &X);    int operator>(const operand &X) const;    int operator<(const operand &X) const;    int operator>=(const operand &X) const;    int operator<=(const operand &X) const;    int operator==(const operand &X) const;    int operator!=(const operand &X) const;};#endif