Grouping switch statement cases together

Question

I may be over looking something but is there a simple way in C   to group cases together instead of writing them out individually  I remember in basic I could just do   SELECT CASE Answer CASE 1  2  3  4   Example in C    For those that need it     include  lt iostream h gt   include  lt stdio h gt  int main        int Answer     cout  lt  lt   How many cars do you have       cin  gt  gt  Answer     switch  Answer                                                      case 1        case 2        case 3        case 4           cout  lt  lt   You need more cars              break                                                case 5        case 6        case 7        case 8           cout  lt  lt   Now you need a house              break                                                default           cout  lt  lt   What are you  A peace-loving hippie freak                   cout  lt  lt    nPress ENTER to continue       lt  lt  endl        getchar          return 0

User · Answer

You can use like this   case 4  case 2          code          For use 4 or 2 switch case

User · Answer

Your example is as concise as it gets with the switch construct

User · Answer

If you re willing to go the way of the preprocessor abuse  Boost Preprocessor can help you        include  lt boost preprocessor seq for each hpp gt        define CASE case ign  ign2  n  case n        define CASES seq            BOOST PP SEQ FOR EACH CASE case     seq       CASES  1  3  15  13     Running this through gcc with -E -P to only run the preprocessor  the expansion of CASES gives       case 1  case 3  case 15  case 13    Note that this probably wouldn t pass a code review  wouldn t where I work   so I recommend it be constrained to personal use   It should also be possible to create a CASE RANGE 1 5  macro to expand to      case 1  case 2  case 3  case 4  case 5    for you as well

User · Answer

You can t remove keyword case  But  your example can be written shorter like this   switch   Answer - 1    4                                             case 0        cout  lt  lt   You need more cars          break                                             case 1        cout  lt  lt   Now you need a house          break                                             default        cout  lt  lt   What are you  A peace-loving hippie freak

User · Answer

include  lt stdio h gt  int n   2  int main          switch n                   case 0  goto  4 break            case 1  goto  4 break            case 2  goto  4 break            case 3  goto  4 break            case 4                 4                  printf  Funny and easy  n                    break            default                  printf  Search on StackOverflow  n                    break

User · Answer

AFAIK all you can do is omit the returns to make things more compact in C     switch Answer        case 1  case 2  case 3  case 4          cout  lt  lt   You need more cars            break               You could remove the other returns as well  of course

User · Answer

No  unless you want to break compatibility and your compiler supports it

User · Answer

No  but you can with an if-else if-else chain which achieves the same result   if  answer  gt   1  amp  amp  answer  lt   4    cout  lt  lt   You need more cars    else if  answer  lt   8    cout  lt  lt   Now you need a house    else   cout  lt  lt   What are you  A peace-loving hippie freak      You may also want to handle the case of 0 cars and then also the unexpected case of a negative number of cars probably by throwing an exception   PS  I ve renamed Answer to answer as it s considered bad style to start variables with an uppercase letter   As a side note  scripting languages such as Python allow for the nice if answer in  1  2  3  4  syntax which is a flexible way of achieving what you want

User · Answer

gcc has a so-called  case range  extension   http   gcc gnu org onlinedocs gcc-4 2 4 gcc Case-Ranges html Case-Ranges  I used to use this when I was only using gcc  Not much to say about it really -- it does sort of what you want  though only for ranges of values   The biggest problem with this is that only gcc supports it  this may or may not be a problem for you    I suspect that for your example an if statement would be a more natural fit

User · Answer

Sure you can    You can use case x     y for the range  Example     include  lt iostream h gt   include  lt stdio h gt  int main        int Answer     cout  lt  lt   How many cars do you have       cin  gt  gt  Answer     switch  Answer                                                      case 1     4           cout  lt  lt   You need more cars              break                                                case 5     8           cout  lt  lt   Now you need a house              break                                                default           cout  lt  lt   What are you  A peace-loving hippie freak                   cout  lt  lt    nPress ENTER to continue       lt  lt  endl        getchar          return 0      Make sure you have  -std c  0x  flag enabled within your compiler

[c++] Grouping switch statement cases together?

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