c – 有什么区别？指向数组与正常数组的指针

If you
want to be able to alter the size of
your array at run time,then declare
dynamic arrays. These are done with
pointers and the new operator. For the
basics on pointers,read the pointers
section.

Allocate memory using new,and then
you access the array in the same way
you would a static array. For example,

int* arrayPtr = new int[10]; for
(int i = 0; i < 10; i++) {
arrayPtr[i] = i; }

The memory picture is identical to the
static array,but you can change the
size if you need to. Don’t forget you
must deallocate the memory before
allocating new memory (or you will
have a memory leak).

delete [] arrayPtr; // the []
is needed when deleting array pointers
arrayPtr = new int[50]; . . .

When you’re completely done with the
array,you must delete its memory:

delete [] arrayPtr;

Dynamic multi-dimensional arrays are
done in a similar manner to Java. You
will have pointers to pointers. For an
example,see a

我的理解是,C中的数组只是引用数组中第一个元素的内存地址.

那么int * pointerarray = new int [10]有什么区别？和int数组[10];如果有的话

我做了一些测试,似乎表明他们做同样的事情.网站错了还是我读错了？

#include <cstdlib>
#include <iostream>

using namespace std;

int main(int argc,char** argv) {

    // Initialize the pointer array
    int *pointerarray = new int[10];
    for (int i = 0; i < 10; i++){

        pointerarray[i] = i;
    }

    // Initialize the regular array
    int array[10];
    for (int i = 0; i < 10; i++){

        array[i]= i;
    }

    cout << *(pointerarray + 5) << endl;
    cout << *(array + 5) << endl;

    cout << pointerarray[5] << endl;
    cout << array[5] << endl;

    cout << pointerarray << endl;
    cout << array << endl;

    return 0;
}

输出：

5
5
5
5
0x8f94030
0xbfa6a37c

我试图按照网站上的描述“动态地重新调整”我的指针数组,但是我的新(较大)指针数组最后填满了0,这不是很有用.