Третья группа

Задания

Streams

Наследуясь от класса OutputStream реализовать Иерархию классов FileOutputStream, StringOutputStream, ConsoleOutputStream имеющие соответствующую функциональность.

struct OutputStream
{
    virtual void print( std::string const& s ) = 0;

    virtual void print( int t ) 
    {
        char buff[16] = {};
        sprintf(buff, "%d", t);
        print(buff);
    }

    virtual void print( double t ) 
    {
        char buff[16] = {};
        sprintf(buff, "%f", t);
        print(buff);
    }

    virtual void flush() = 0;

    virtual ~OutputStream() {}
};

Rationals

// Rational.h

class Rational {

    Rational & operator+=( Rational const& b );

    Rational & operator-=( Rational const& b );

    Rational & operator/=( Rational const& b );

    Rational & operator*=( Rational const& b );

    Rational operator-() const;

    double to_double() const;

    int nom();
    int den();

};

ostream & operator<<(ostream & os, Rational const& r);
istream & operator>>(istream & is, Rational & r);

Rational  operator+( Rational a, Rational const& b );
Rational  operator-( Rational a, Rational const& b );
Rational  operator/( Rational a, Rational const& b );
Rational  operator*( Rational a, Rational const& b );

bool operator==( Rational const& a, Rational const& b );
bool operator!=( Rational const& a, Rational const& b );
bool operator<( Rational const& a, Rational const& b );
bool operator<=( Rational const& a, Rational const& b );
bool operator>( Rational const& a, Rational const& b );
bool operator>=( Rational const& a, Rational const& b );
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