can you guys help fix this error plz

Im using myprogramming lab,
the problem is this:
The variables arr1 and arr2 have been declared as pointers to integers. An array of 10 elements has been allocated, its pointer assigned to arr1, and the elements initialized to some values. Allocate an array of 20 elements, assign its pointer to arr2, copy the 10 elements from arr1 to the first 10 elements of arr2, and initialize the remander of the elements of arr2 to 0.

here is my code:
1 main() {
2 int *arr1, *arr2;
3
4 for(int i = 0; i < 20; i++)
5 {
6 arr2[i] = new int(i);
7 if(i < 10)
8 {
9 arr2[i] = arr1[i];
10 }
11 else
12 {
13 arr2[i] = 0;
14 }
15 }