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Answer Posted / naga
Consider two objects, A and B, which each refer to two
memory blocks xi and yi (i = 1, 2,...). Think of A and B as
strings and of xi and yi (i = 1, 2,...) as the characters
they contain.
Shallow copy
One of them is the shallow copy. In this process B is
attached to the same memory block as A. This is otherwise
known as address copy
Deep copy
An alternative is a deep copy. Here the data is actually
copied over.
Example:
class base
{
public:
int i;
base()
{
i=0;
}
base(int j)
{
i=j;
}
};
main()
{
using namespace std;
base *p1=new base(23);
base *p2;
//Shallow copy, here we are using pointers and we are
copying content of one pointer to another.so address will
get copied.
p2=p1; // address is copied
cout<<"\naddress of P1:"<<p1;
cout<<"\nvalue at p1:"<<p1->i;
cout<<"\naddress of P2:"<<p2;
cout<<"\nvalue at p2:"<<p2->i;
delete p2;
cout<<"\naddress of P1 after delete:"<<p1;
cout<<"\nvalue in P2 after delete:"<<p2->i;
//DEEP copy, here we are creating objects and we are
copying content of one object to another.So content will
get copied.
base o1(67);
base o2;
o2=o1;//contents are copied. But, the addresses
remained different
cout<<"\nvalue in o1:"<<o1.i;
cout<<"\nvalue in o2 after copy:"<<o2.i<<endl;
return 0;
}
output:
address of P1:0x00323C88
value at p1:23
address of P2:0x00323C88
value at p2:23
address of P1 after delete:0x00323C88
value in P2 after delete:-572662307
value in o1:67
value in o2 after copy:67
| Is This Answer Correct ? | 18 Yes | 1 No |
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Objective The objective of this problem is to test the understanding of Object-Oriented Programming (OOP) concepts, in particular, on encapsulation. Problem Description Create a program for managing customer’s bank accounts. A bank customer can do the following operations: 1. Create a new bank account with an initial balance. 2. Deposit money into his/her account. 3. Withdraw money from his/her account. For this operation, you need to output “Transaction successful” if the intended amount of money can be withdrawn, otherwise output “Transaction unsuccessful” and no money will be withdrawn from his/her account. Input The input contains several operations and is terminated by “0”. The operations will be “Create name amount”, “Deposit name amount”, or “Withdraw name amount”, where name is the customer’s name and amount is an integer indicating the amount of money. There will be at most 100 bank accounts and they are all created on the first month when the bank is opening. You may assume that all account holders have unique names and the names consist of only a single word. Output The output contains the transaction result of withdrawal operations and the final balance of all customers after some withdrawal and deposit operations (same order as the input). Sample Input Create Billy 2500 Create Charlie 1000 Create John 100 Withdraw Charlie 500 Deposit John 899 Withdraw Charlie 1000 0
