[naveed2026]

Code:

#include<iostream.h>
#include<stdlib.h>
#include<string.h>
class String
{
private :
char string [ 30 ] ;
public :
String ( )
{
       strcpy ( string , "" ) ;
       }
       
void getString ( )
{
cout << "Enter the String : " ;
cin >> string ;
}
void display( )
{
cout << "The String Is : " << string << endl ;
}  // Declaration (prototype) of overloaded sum operator
String operator + ( String & s ) ;
String operator += ( String & s ) ;

void main()
{
     String s1,s2,s3;
     s3=s1+s2;
     s3.display();
     }
};

String String :: operator + ( String &s )
{
String temp; // Declared object temp of String type
strcpy ( temp.string , "" ); // Initialized the temp with empty string
strcat ( temp.string , string ); // Concatenated the driving object's string to //temp object
strcat ( temp.string , s.string ); // Concatenated the argument's string to the
// temp object
return temp; // Returned the temp object
}

String String :: operator += ( String &s )
{
String temp; // Declared object temp of String type
strcpy ( temp.string , "" ); // Initialized the temp with empty string
strcat ( temp.string , string ); // Concatenated the driving object's string to //temp object
temp=temp+s;

return temp; // Returned the temp object
}

[Nico]

use cstdio instead of stdio.h and iostream instead of iostream.h

From: Deprecated Or Antiquated Header - C++