while ( 1 ) {

  # yadda yadda

  last if some_condition();

  # yadda yadda

}

##</code><code>##

loop { # begin of enclosing block

  # pre-test code

} while ( some_condition() ) {

  # post-test code;

}

##</code><code>##

{

  # pre-code

  last if some_condition();

  # post-code

  redo;

}