switch-case statement without break

Question

According to this book I am reading：

Q What happens if I omit a break in a switch-case statement?

A The break statement enables program execution to exit the swi

Answer 1

• If you don't include break in any of case then all the case below will be executed and until it sees break.

• And if you don't include break in default then it will cause no effect as there are not any case below this 'Default' case.

• And not using break generally considered as a bad practice but some time it may also come handy because of its fall-through nature.For example:

  case optionA:

  //optionA needs to do its own thing, and also B's thing.
  //Fall-through to optionB afterwards.
  //Its behaviour is a superset of B's.
  

  case optionB:

  // optionB needs to do its own thing
  // Its behaviour is a subset of A's.
  break;
  

  case optionC:

  // optionC is quite independent so it does its own thing.
  break;