[c-prog] sizeof elements in an array

[John Matthews]

Hi- in C, is it guaranteed that

  (unsigned)&ptr[1] - (unsigned)&ptr[0] == sizeof ptr[0]

and hence that

  ptr = malloc(n * sizeof ptr[0]);

will (attempt to) allocate enough memory for ptr[0..n-1] ? Or do you
have to allow for possible padding etc.?

John