#ifndef CalcEng_SEEN__
#define CalcEng_SEEN__
///////    File CalcEng.h    ///////

class CalcEng
{   public:
        CalcEng();
        void operate(char c); 
        char operation() { return op; }
        void operand(double in) ;
        double output()
	{ return( argcnt == 2 ? arg : ans ); }
    private:
        void compute();
        void allclear();
        double ans, arg;
        int argcnt;
        char op;
};

#endif