C++ Important pro

An example of creating a stream-enabled object

#include

#include

#include

#include

#include

 using namespace std;

std::string timestamp();   

class logstatement;

ostream& operator<<(ostream& ost, const logstatement& ls);

 class logstatement

{

public:

        logstatement(std::string s): data(s), time_string( timestamp() )

        { };

        friend ostream& operator<<(ostream&, const logstatement&);  

private:

        std::string data;

        std::string time_string;

 };

 ostream& operator<<(ostream& ost, const logstatement& ls)

{

        ost<<"~|"<

        return ost;

}

std::string timestamp()

{

        ostringstream stream;   

        time_t rawtime;

        tm * timeinfo;

        time(&rawtime);

        timeinfo = localtime( &rawtime );

        stream << (timeinfo->tm_year)+1900<<" "<tm_mon

        <<" "<tm_mday<<" "<tm_hour

        <<" "<tm_min<<" "<tm_sec;

        return stream.str();  

}

int main(int argc, char** argv)

{

        if(argc<2 span="">

        {

              return -1; 

        }

        ostringstream log_data;

        for(int i=1;i

        {

               log_data<

        }

        logstatement log_entry(log_data.str());

        clog<

        ofstream logfile("logfile",ios::app);

        if ( ! logfile )     

        {

                return -1;

        }      

        logfile<

        logfile.close();

        return 0;

}

Pointers or references for polymorphism

#include

#include

#include

using namespace std;

class stringconvertable

{

    public:

    virtual string toString () = 0;

};

 void displayobject (stringconvertable* obj)

{

    cout << obj->toString() << '\n';

}

The C++ Modulus Operator

#include

#include

using namespace std;

int main()

{

    int num;

    cin >> num;

    if ( num % 2 == 0 )

    {

        cout << num << " is even ";

    }

    return 0;

}

Getting Random Values in C and C++ with Rand

#include 

#include 

#include 

using namespace std;

int main()

{

time_t seconds;

time(&seconds);

srand((unsigned int) seconds);

cout<< rand() << endl;

cout<< rand() << endl;

cout<< rand() << endl;

return 0;

}

C++ Code program

#include 

#include

#include 

#include 

const int low = 1;

const int high = 6;

using namespace std;

int main()

int first_die, sec_die;

time_t seconds;

time(&seconds);

srand((unsigned int) seconds);

first_die = rand() % (high - low + 1) + low;

sec_die = rand() % (high - low + 1) + low;

cout<< "Your roll is (" << first_die << ", "

<< sec_die << "}" << endl << endl;

first_die = rand() % (high - low + 1) + low;

sec_die = rand() % (high - low + 1) + low;

cout<< "My roll is (" << first_die << ", "

<< sec_die << "}" << endl << endl;

return 0;

}