Best method to create a sub array from an array in C

Question

I have an array say a[3]={1,2,5} . I have to create another array a2[2]={2,5}.

What I have tried is to just create a new array a2[] and just copy all the elements from the required position range.

Is there any other method to accomplish this in C?.

Answer 1

memcpy(a2, &a[1], 2*sizeof(*a));

Answer 2

Instead of having a second array, just use a pointer:

int a[3]={1,2,5};
int *p = &a[1];

If they have to be distinct, you have no choice other than to copy the array elements into a new array.