how to use switch case for a range of number

Question

As above...  could this statement work ?  case (0 - 500)

public void Switch(int num)
{
  switch (num)
  {
    case (0-500):
      // belong to 0-500;
     break;
    case (501-1000):
       // belong to 501-1000;
      break;
  }
}

Answer 1

Have you tried it?  Posting takes longer than testing in the IDE.

Answer 2

You can't really do that with a switch.

You can do:

if (num >= 0 && num <= 500) { ........}
else if (num >= 501 && num <= 1000) {.............}

---

John Grove - TFD Group, Senior Software Engineer, EI Division, http://www.tfdg.com

Answer 3

You can do it with small ranges of numbers like so:

switch (myInt)
{
    case 0:
    case 1:
    case 2:
        // do something
        break;
    etc...
}

But I definately wouldn't recommend that for 500 of em.

Answer 4

JohnWein, that doesn't work in C# unfortunately. The switch only deals with constants

---

John Grove - TFD Group, Senior Software Engineer, EI Division, http://www.tfdg.com

Answer 5

The answer is NO!

See the same question and answer here:
http://social.msdn.microsoft.com/forums/en-US/csharpgeneral/thread/c46bee82-ac9a-4f15-bcc0-9e5baa557916/

VB can do it but not C#. People suggested using if/else.

Oh, by the way, (0 - 500) is an expression and
(0 - 500) = -500 

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John Chen -- See my team blog: http://blogs.msdn.com/vsdata

Answer 6

JohnWein, that doesn't work in C# unfortunately. The switch only deals with constants

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John Grove - TFD Group, Senior Software Engineer, EI Division, http://www.tfdg.com

What doesn't work in C#?  You can certainly write code that doesn't work in the IDE.  Try it.

Answer 7

Read the documentation here on switch

switch (expression)

{

   case constant-expression
:

      statement

      jump-statement

   [default:

      statement

      jump-statement]

}

---

John Grove - TFD Group, Senior Software Engineer, EI Division, http://www.tfdg.com

Answer 8

Read the documentation here on switch

switch (expression)


{


   case constant-expression

:


      statement


      jump-statement


   [default:


      statement


      jump-statement]


}

---

John Grove - TFD Group, Senior Software Engineer, EI Division, http://www.tfdg.com

If this post is for my benefit, read my original post in this thread.  The OP should have been able to answer his question without posting it to a forum.  If you need assistance start a new thread.

Answer 9

Hi,
After I see all this answers there is no comment they are right you can't, so the best solution With such large ranges it is easier to use if - else if statements.

 Thanks

 

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My Blog

Answer 10

It wasn't directed at you JohnWein, it was meant for all, generally speaking.

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John Grove - TFD Group, Senior Software Engineer, EI Division, http://www.tfdg.com

Answer 11

As long as it is a range with a constant interval, you can map the range to an integer:

  int range = (num-1) / 500;
  switch (range) {
    case 0: break; // 1-500
    case 1: break; // 501-1000
    // etc...
  }

if/else for non-constant intervals.

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Hans Passant.