Allocating normal variables (int ?) ?

Hi, I getting familiar with allocating, but all I have been allocating is arrays

1
2
3
4
5
6
7
        int numberstocount, numbers[1];
	int* p_numbers = numbers;

	cout << "enter number to be counted : ";
	cin >> numberstocount;

	p_numbers = new int[numberstocount];


I have tried allocating normal variables (variables that hold simple numbers).
But I have been getting same results.

I use this is the code :

1
2
3
4
5
6
7
8
	int x = 20;
	int* p = &x;

	cout << x << endl;
	
	p = new int[100];

	cout << x;


can I allocate normal variables ? I know I can, but how ? am I doing something wrong ?

Allocating arrays:
1
2
3
4
5
6
7
8
int count;
std::cout << "How lagrge should array be?\n";
std::cin >> count;

int* array = new int[count];

//Somewhere later
delete[] array;


Allocating single variable:
1
2
3
4
int* var = new int;

//Somewhere later
delete var;
still getting same result. can you make a simple program that work ? like this

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
int main()
{
	int x = 20;
	int* p = &x;

	cout << x << endl;
	
	p = new int;

	cout << x;

	cin.ignore();
	cin.get();
	return 0;
}



^this don't work,
Last edited on
It work. Exactly like it should. What your problem with it?

If you want another behavior, tell and I will show you.

BTW, whay do you need line 3? You do not access x through p, why are you assigning its address to p?

If you want to change values through pointer:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
int main()
{
    int x = 20;
    std::cout << " x = " << x << '\n';

    int* p = &x;
    *p = 10;
    std::cout << " x = " << x << '\n';
    std::cout << "*p = " << *p << '\n';

    p = new int;
    *p = -100;
    std::cout << " x = " << x << '\n';
    std::cout << "*p = " << *p << '\n';

    *p = 25;
    std::cout << " x = " << x << '\n';
    std::cout << "*p = " << *p << '\n';
    delete p; //NEVER forget to delete allocated memory
    std::cin.ignore();
    std::cin.get();
}
 x = 20
 x = 10
*p = 10
 x = 10
*p = -100
 x = 10
*p = 25
http://ideone.com/dPHVI5
Registered users can post here. Sign in or register to post.