实现一维动态数组

include

include<malloc.h>

using namespace std;

void output(int n)
{
int* arr = (int*)malloc(sizeof(int) * n);//在c++中，则是int * arr = new int[n];
if (arr == NULL)
return;

for (int i = n; i <= 2 * n - 1; i++)
{
	arr[i-n] = i;
	cout << arr[i-n] << " ";
}
free(arr);

}

int main()
{
int n;
cin >> n;
output(n);
}

实现二维动态数组
void output(int n)
{
int** arr;
arr = (int**)malloc(sizeof(int) * n);//在c++中，则是arr = new int [n];

if (arr == NULL)
	return;

for (int i = 0; i < n; i++)
{
	arr[i] = (int*)malloc(sizeof(int) * n);//在c++中，则是arr[i] = new int[n];
    if (arr[i] == NULL)
              return;

	for (int j = 0; j < n; j++)
	{
		*(*(arr + i) + j) = i + j;//或者arr[i][j] = i + j;
		cout << *(*(arr + i) + j) << " ";//或者cout << arr[i][j] << " "
	}
	cout << endl;
}

}

int main()
{
int n;
cin >> n;
output(n);
}