Operator overloading – String Concatenation C++

In ‘C’ or ‘C++’ the string concatenation not possible by adding two string like Java but often questions are given to do so using Operator Overloading + operator. Here is an example to solve this problem.

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Example :

 #include<iostream.h>

  class String

      {

           private:

              char *s;

              int size;

           public:

               void getData()

                   {

                        cout<<"\n\tEnter Size : ";

                        cin>>size;

                        cin.ignore();

                        s = new char [size];

                        cout <<"\n\tEnter String:";

                        cin.getline(s, size);

                   }

               void display()

                   {

                        cout<<s;

                   }

               String operator +(String s2)         // ‘+’ operator overloaded

                   {

                        String ts;

                        ts.s = new char [size+s2.size];

                        for(int i = 0; s[i]!='\0';i++)

                            {

                                ts.s[i] = s[i];

                            }

                        for(int j = 0; s2.s[j]!='\0'; i++, j++)

                            {

                                ts.s[i] = s2.s[j];

                            }

                        ts.s[i] = '\0';

                        return ts;

                   }

      };

  int main()

      {

           String s1, s2, s3;

           s1.getData();

           s2.getData();

           cout<<"\n\tFirst String : ";

           s1.display();

           cout<<"\n\tSecond String : ";

           s2.display();

           s3 = s1 + s2; //overloading ++’ operator

           cout<<"\n\tAfter Concatenation : ";

           s3.display();

           return 0;

      }