Overload subscript operator [] in C ++

The subscript operator [] in C ++ is often used to access array elements. This operator can be overloaded to enhance an existing feature of arrays in C ++ (so it can be called an array index operator).

The following example illustrates how to load the subscript operator [] in C ++:

 #include using namespace  std ; const int  KICHCO  = 15 ; class ViDuMang { private : int  mang [ KICHCO ]; public : ViDuMang () { register int  i ; for ( i  = 0 ;  i  <  KICHCO ;  i ++) {  mang [ i ] =  i ; } } int & operator []( int  i ) { if (  i  >  KICHCO  ) {  cout  << "n======================n" << endl ;  cout  << "Chi muc vuot gioi han!!" << endl ; // Tra ve phan tu dau tien. return  mang [ 0 ]; } return  mang [ i ]; } }; int  main () { ViDuMang  V ;  cout  << "Gia tri cua V[3] la: " <<  V [ 3 ] << endl ;  cout  << "Gia tri cua V[6] la: " <<  V [ 6 ]<< endl ;  cout  << "Gia tri cua V[16] la: " <<  V [ 16 ]<< endl ; return 0 ; } 

Compiling and running the above C ++ program will produce the following results:

According to Tutorialspoint

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