Is a[5] == 5[a]? If yes why?

Answer 1

In C, Array can be represented as pointer and vice versa.

so,
instead of a[5] we can also write *(a+5).
instead of 5[a] we can also write *(5+a).

so, a[5] == 5[a]

Comments

You got it right.

Answer 2

main()
{
   int a[]={1,2,3,4,5,6,7,8};

   if (a[5] == 5[a])
     printf("Equal");
}

Now come on the explanation -
a[5] means *(a+5) and 5[a] means *(5+a) and we know both are same.