ifndef array class define ArraY CLass Include <iostream h> include <stdlib. h> ifndef null const int nUll〓0 # endif∥NULL enum ErrorType IinvalidArraySize, memory Allocation Error, indexOutofRange 3 char *errorMMsgn i"Invalid array size ,"Memory allocation error Invalid index. }#ifndef ARRAY_CLASS #define ARRAY_CLASS #include <iostream.h> #include <stdlib.h> #ifndef NULL const int NULL = 0; #endif // NULL enum ErrorType { invalidArraySize, memoryAllocationError, indexOutOfRange }; char *errorMsg[] = { "Invalid array size", "Memory allocation error", "Invalid index: " };