can size of array be determined at run time in c?

Question

As I know, an array needs to have a specific size before compiling time in c.

I wonder why this code still works?

int s;
printf(\"enter the array si         


        

Answer 1

If you need to allocate an array with dynamic size, you have to get it from the heap, with malloc().

int *a = malloc(sizeof(int) * s)