Interested to Buy Any Domain ? << Click Here >> for more details...
int main()
{
int *p=new int;
*p=10;
del p;
cout<<*p;
*p= 60;
cout<<*p;
}
what will be the output & why?
- 4 Answers
- 12567 Views
- TCS, I also Faced
- E-Mail Answers
Answer Posted / jaroosh
There will be an error because its "del" instead of "delete".
In this particular program, you might actually get away with
using p after delete, but lets look what happens here :
int *p=new int;
*p=10;
cout << "ADDRESS OF P is " << p << endl;
delete p;
int * x= new int(3);
cout << "ADDRESS OF X=" << *x << " is " << x << endl;
*p = 10; //We think we got away with deleting p so why not
//still use it!
cout << "VALUE OF X : " << *x; //Here is why...
now, though its basically a policy of compiler, here is what
probably WILL happen in the output (memory addresses are
exemplary):
ADDRESS OF P is 0x272740
ADDRESS OF X=3 is 0x272740
VALUE OF X : 10
Now this is totally NOT what we would like our program to
do, and this is because though delete WILL mostly call
objects destructors and sometimes even clear memory, but p
is STILL pointing to that location, to which compiler
assumes it is safe to allocate variable x!
So now we end up having ONE memory storage and two pointers
p and x pointing to it.
This is why though it will not crash your compilation and
probably you can get away with no runtime errors, this leads
to serious troubles and as a rule NEVER use pointers after
you deleted their storage.
| Is This Answer Correct ? | 7 Yes | 1 No |
Post New Answer View All Answers
c language supports bitwise operations, why a) 'c' language is system oriented b) 'c' language is problem oriented c) 'c' language is middle level language d) all the above
What is array within structure?
What is the general form of a C program?
Can we change the value of static variable in c?
Why cant I open a file by its explicit path?
List the variables are used for writing doubly linked list program.
What do you mean by invalid pointer arithmetic?
What is cohesion in c?
Why is c called c not d or e?
Write a program to swap two numbers without using third variable?
what are bit fields in c?
What is meant by operator precedence?
What is c language & why it is used?
What are Macros? What are its advantages and disadvantages?
Which type of language is c?
