Using continue in a switch statement

Question

I want to jump from the middle of a switch statement  to the loop statement in the following code   while  something   get something          switch  something            case A      case B          break      default             get another something and try again         continue               do something for a handled something     do something        Is this a valid way to use continue  Are continue statements ignored by switch statements  Do C and C   differ on their behaviour here

User · Answer

Yes  continue will be ignored by the switch statement and will go to the condition of the loop to be tested  I d like to share this extract from The C Programming Language reference by Ritchie   The continue statement is related to break  but less often used  it causes the next iteration of the enclosing for  while  or do loop to begin  In the while and do  this means that the test part is executed immediately  in the for  control passes to the increment step  The continue statement applies only to loops  not to  a switch statement  A continue inside a switch inside a loop causes the next loop iteration   I m not sure about that for C

User · Answer

Switch is not considered as loop so you cannot use Continue inside a case statement in switch

User · Answer

This might be a megabit to late but you can use continue 2   Some php builds   configs will output this warning      PHP Warning    continue  targeting switch is equivalent to  break   Did you mean to use  continue 2     For example    i   1   while   i  lt   10         mod    i   4      echo   r n out  i        i        switch  mod                case 0              break          case 2              continue              break          default              continue 2              break            echo   is even       This will output   out 1 out 2 is even out 3 out 4 is even out 5 out 6 is even out 7 out 8 is even out 9 out 10 is even   Tested with PHP 5 5 and higher

User · Answer

While technically valid  all these jumps obscure control flow -- especially the continue statement   I would use such a trick as a last resort  not first one   How about  while  something   get something          switch  something            case A      case B          do something                      It s shorter and perform its stuff in a more clear way

User · Answer

It s syntactically correct and stylistically okay   Good style requires every case  statement should end with one of the following    break   continue   return  x    exit  x    throw  x      fallthrough   Additionally  following case  x   immediately with   case  y    default    is permissible - bundling several cases that have exactly the same effect   Anything else is suspected to be a mistake  just like if a 4       Of course you need enclosing loop  while  for  do   while  for continue to work  It won t loop back to case   alone  But a construct like   while record   getNewRecord          switch record type                case RECORD TYPE                              break          default    unknown type             continue    skip processing this record altogether                 more processing           is okay

User · Answer

Yes  it s OK - it s just like using it in an if statement  Of course  you can t use a break to break out of  a loop from inside a switch

User · Answer

It s fine  the continue statement relates to the enclosing loop  and your code should be equivalent to  avoiding such jump statements    while  something   get something          if  something    A    something    B          do something        But if you expect break to exit the loop  as your comment suggest  it always tries again with another something  until it evaluates to false   you ll need a different structure   For example   do       something   get something      while    something    A    something    B    do something

[c++] Using continue in a switch statement

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