memcpy(), what should the value of the size parameter be?

Question

I want to copy an int array to another int array. They use the same define for length so they\'ll always be of the same length.

What are the pros/cons of the followi

Answer 1

It depends. Both arr and pointer are arrays, but sizeof() returns only the correct size for arr, which is declared at compile time.

int main() {
        int arr[10];
        int * pointer;
        pointer = (int *) malloc(10 * sizeof(int));
        printf("%d\n", sizeof(arr)); // 40
        printf("%d\n", sizeof(pointer)); // 4 or 8
        free(pointer);
}