UVA - 123

    /*
    No.9: Use of dynamic constructors

    Created By GSC,CSE,IIUC.
    Date: 17-02-15
    Time: 2:18:01 am
    Facebook: www.facebook.com/gsc.cse
    E-mail: sarwar.pustcse1@gmail.com
    Skype: sarwar_pust_cse
    Mobile: 01861500457
    */
# include <iostream>
# include <cstring>
using namespace std;
class dycon
{
    char *st;
    int len;
    public:
        dycon()
        {
            //len=0;
            //st=new char[len+1];
        }
        dycon(char *s)
        {
            len=strlen(s);
            st=new char[len+1];// one additional space for \0 (Null)
            strcpy(st,s);
        }
        void show()
        {
            cout<<"NAME IS: "<<st<<endl;
        }
        void join(dycon &a,dycon &b);// copy constructor
};

void dycon::join(dycon &a,dycon &b)
{
    len=a.len+b.len;
    delete st;// free merory
    st=new char[len+1];// dynamic allocation
    strcpy(st,a.st);
    strcat(st,b.st);
};

main()
{
    char *first="Just ";
    dycon n1(first),n2("Start "),n3("Now"),n4,n5;

    n4.join(n1,n2);
    n5.join(n4,n3);
    n1.show();
    n2.show();
    n3.show();
    n4.show();
    n5.show();
}