switch statement C++ with some commands

Asked Sep 21 '16 at 15:55

Active Sep 21 '16 at 15:55

Viewed 61 times

I have a question. How more correct use operator switch with blocks of commands:

switch(a)
{
   case 1: 
        {
         command1;
         command2;
         commandN;
         break;
        }
   case 2: 
        {
         command3;
         command4;
         commandN;
         break;
        }
}

switch(a)
{
   case 1: 
         command1;
         command2;
         commandN;
         break;

   case 2:       
         command3;
         command4;
         commandN;
         break;     
}

Use or not { ... } in case? Any version is working, but how more correctly? Thanks.

asked Sep 21 '16 at 15:55

Влад Март

`command;` actually looks like a NOP? – πάντα ῥεῖ Sep 21 '16 at 15:56
12

You only need the braces if you're going to use local variables within the case block. – Paul R Sep 21 '16 at 15:56
3

Similar to this question: http://stackoverflow.com/questions/4241545/c-switch-case-curly-braces-after-every-case – Jacob Sep 21 '16 at 15:57
Upvoted because this is a valid question; I've often thought about it. – Thomas Matthews Sep 21 '16 at 15:58
1

@ThomasMatthews C'mon, it's pretty obvious when you'll need braces or not. – πάντα ῥεῖ Sep 21 '16 at 15:59
Actually, my question is whether the `break` should be inside the braces or not. – Thomas Matthews Sep 21 '16 at 16:00
Also related: http://stackoverflow.com/questions/7044574/about-the-braces-in-case-statement-in-switch – NathanOliver Sep 21 '16 at 16:00
1

@ThomasMatthews It doesn't matter, but I personally prefer to keep it outside. – πάντα ῥεῖ Sep 21 '16 at 16:02
_@Влад Март_ _"Any version is working ..."_ Not really, it depends what you need to have inside the `case` section. Your (pseudoi) code sample is meaningless. – πάντα ῥεῖ Sep 21 '16 at 16:05
Compare [this](http://coliru.stacked-crooked.com/a/818cba8dde9517bc) vs [this](http://coliru.stacked-crooked.com/a/a409eafbd3e4bcb5) – Simon Kraemer Sep 21 '16 at 16:27

switch statement C++ with some commands

0 Answers0