Define a class String that could work as a user-defined string type. Include constructors that will enable us to create an uninitialized string String s1; and also to initialize an object with a string constant at the time of creation like String s2(“Well done”); Include a function that adds two strings to make a third string. Write a complete program to test your class to see that it does the following tasks : (a) Creates uninitialized string objects. (b) Creates objects with string constants. (c) Concatenates two strings properly. (d) Displays a desired string object.

 #include <iostream>

using namespace std;

#include <string.h>

class STRING

{

    char *str;

    int length;

public:

    STRING()

    {

        length = 0;

        str = new char[length + 1];

    }

    STRING(char *s)

    {

        length = strlen(s);

        str = new char[length + 1];

        strcpy(str, s);

    }

    void concat(STRING &A,STRING &B){

        length=A.length+B.length;

        str = new char[length + 1];

        strcat((strcpy(str,A.str)),B.str);

    }

    STRING(STRING &x){

        length=x.length+strlen(x.str);

        str = new char[length + 1];

        strcpy(str,x.str);

    }

    void display(){

        cout<<str<<endl;

    }

};

int main()

{

STRING A("hu"),B("hua");

STRING C;

C.concat(A,B);

C.display();

C=B;

C.display();

    return 0;

}