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HellBound Hackers | Computer General | Programming
Author

Can someone explain the difference here? (Dynamic Memory)
ETep
Member



Posts: 6
Location:
Joined: 26.05.10
Rank: Wiseman
Posted on 31-05-10 02:02
I realize this is a very noobish question but can someone explain to me the difference between these two snippets of code?

The way I understand it, CODE 2 should not compile. However, under Dev C++, it compiles and runs fine....which makes me wonder why would you use CODE 1.

***************CODE 1***************
#include <iostream>
#include <new>
using namespace std;

int main ()
{
int i,n;
int * p;
cout << "How many numbers would you like to type? ";
cin >> i;
p= new (nothrow) int[i];

***************CODE 2***************
#include <iostream>
#include <new>
using namespace std;

int main ()
{
int i,n;
cout << "How many numbers would you like to type? ";
cin >> i;
int p[i];

756E6F726967696E616C




Edited by ETep on 31-05-10 03:45
Author

RE: Can someone explain the difference here? (Dynamic Memory)
fleandr
Member

Posts: 17
Location:
Joined: 22.04.10
Rank: HBH Guru
Posted on 31-05-10 06:36
from my noobish point of view both pieces of code are fine. In c++ there is a dynamic memory allocation so np with that. In general you should use code 1. Code 2 is ok till you use value types when you use objects then you need code 1 and explicit constructor calls.
In fact I may be wrong, please correct or delete my post if so.

Edited by fleandr on 31-05-10 06:36
Author

RE: Can someone explain the difference here? (Dynamic Memory)
ETep
Member



Posts: 6
Location:
Joined: 26.05.10
Rank: Wiseman
Posted on 31-05-10 07:25
Ok. That clears a bit up then. Thanks

756E6F726967696E616C
Author

RE: Can someone explain the difference here? (Dynamic Memory)
COM
Banned



Posts: 800
Location:
Joined: 31.08.07
Rank: God
Posted on 31-05-10 10:46
Code 2 should according to old standards indeed not compile. However, certain compilers do offer that type of behaviour, though it shouldn't be allowed. If I recall correctly though, newer standards allow for it or they are at least planning on changing to allow code 2 as well. But, it'll basically result in the same thing as code 1, or at least should.

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