Some one can explain me this ? Why 5 ?

Question

What is the output of this code ? (Int is 4 bytes)
Int x[5];
Int y = sizeof(x) / 4;
Printf("%i",y);

The answer is 5

Answer 1

An array is a contiguous memory block, therefore x is pointer to that memory block. Having x[5] means reserving 20 bytes of memory on the stack ie 4 bytes each element(integer) in the array.
sizeof(x) returns 20 which when divided by 4 returns 5.