Undefined pointers versus NULL pointers item_ptr=NULL means that item_ _ptr currently points to no dynamic object. If the value of item_ptr is undefined, then item_ ptr might point to any random location in memory. important data Random pointer p=new Item 19 884 0 important data 1375 p=1375 p=0 Random pointer 0 G→ ??? p= NULL Random pointer =0 delete p Please modify Pgll8 Figure 4.3 code is c, not c++ Undefined pointers versus NULL pointers : item_ptr = NULL means that item_ptr currently points to no dynamic object. If the value of item_ptr is undefined, then item_ptr might point to any random location in memory. Please modify Pg118 Figure4.3 code is c,not c++