How Does sizeof(Array) work

Question

How does c find at run time the size of array? where is the information about array size or bounds of array stored ?

Answer 1

sizeof() will only work for a fixed size array (which can be static, stack based or in a struct).

If you apply it to an array created with malloc (or new in C++) you will always get the size of a pointer.

And yes, this is based on compile time information.