sizeof behaving unexpectedly

Question

Consider the following code:

  #include 
  int main(void)
  {
    int a[10];
    printf(\"%d\",(int)sizeof(a)); //prints 10*sizeof(int) (40 on         


        

Answer 1

(a-3) has type int*, and it prints you sizeof(int*) which is 4 on your platform.

And note that sizeof() is no longer compile-time constant in C99 (due to variadic-length arrays).