//Implementation of dyn_a1 constructor and destructor inline dyn_a1::dyn_a1(INDEX i) throw() :   d1(i),                    //# of 1D array elements   dummy(0) {   a0 = new(nothrow) int[i]; //total # elements for 1D array   if (a0 == 0) {            //check if new failed     cerr <<"new failed in class dyn_a1" <<endl;     d1 = 0;                 //set # elements to zero   } } inline dyn_a1::~dyn_a1() throw() {   delete[] a0;              //deallocate all array elements } //Implementation of subscript operator inline int &dyn_a1::operator[](INDEX i) throw() {   if (i<0 || i>=d1) {       //check if out of bounds     cerr <<"out of bounds at index " <<i <<endl;     return (dummy);         //reference to dummy element   }   return (a0[i]);           //ith element in 1D array }