Why are multiple semicolons allowed? [duplicate]

Answer 1

Semicolumn is an empty statement, means "do nothing". Typical example when multiply semicolumns are required is an infinite for loop

  for (int i = 0; i < count; ++i) { // <- ordinary for
    ...
  }

  for (;;) { // <- infinite (for) loop with no initialization, check and increment 
    ...
  }