switch-statement ???

[Chris]

Hi,

can you specify a range in a switch - statement ?

switch (i)
{
case 100 - 999 :
// do something
break;
case 1000 - 9999:
// do something else
break;
}

Previous syntax is not allowed, I know,
but can you solve this using 'switch' ? without having to provide a case
statement for every possible value and without using 'if' ?

thanks
Christian

[Michael C]

Hi Chris,

We were discussing the heck out of that a few months ago, and the answer is
(in C#), no. On the other hand, if you only have two ranges as in the
example you posted, an if...else construct would be almost as efficient. If
you have only a couple of options per case statement, case can drop-through
like this:

switch (i)
{
case 100:
case 101:
// do something
break;
case 1000:
case 1001:
case 1002:
// do something else
break;
}

Thanks,
Michael C., MCDBA

"Chris" <ch********@pan dora.be> wrote in message
news:o2******** *************** @phobos.telenet-ops.be...

Hi,

can you specify a range in a switch - statement ?

switch (i)
{
case 100 - 999 :
// do something
break;
case 1000 - 9999:
// do something else
break;
}

Previous syntax is not allowed, I know,
but can you solve this using 'switch' ? without having to provide a case
statement for every possible value and without using 'if' ?

thanks
Christian

[Paul E Collins]

"Chris" <ch********@pan dora.be> wrote:

switch (i)
{
case 100 - 999 :

That will actually compile, but it won't do what you want. (The minus
sign is subtraction, so it's equivalent to "case -899".)

You can't specify ranges in a C# switch statement.

P.

[JuLiE Dxer]

I thought fall-throughs in switch statements were not supported in C#
(design choice).

At least, that's what mentioned on page 224 of Microsoft's "Inside C#"
by Tom Archer

On Sat, 09 Oct 2004 17:32:29 GMT, "Michael C" <mi******@nospa m.org>
wrote:

Hi Chris,

We were discussing the heck out of that a few months ago, and the answer is
(in C#), no. On the other hand, if you only have two ranges as in the
example you posted, an if...else construct would be almost as efficient. If
you have only a couple of options per case statement, case can drop-through
like this:

switch (i)
{
case 100:
case 101:
// do something
break;
case 1000:
case 1001:
case 1002:
// do something else
break;
}

Thanks,
Michael C., MCDBA

"Chris" <ch********@pan dora.be> wrote in message
news:o2******* *************** *@phobos.telene t-ops.be...

Hi,

can you specify a range in a switch - statement ?

switch (i)
{
case 100 - 999 :
// do something
break;
case 1000 - 9999:
// do something else
break;
}

Previous syntax is not allowed, I know,
but can you solve this using 'switch' ? without having to provide a case
statement for every possible value and without using 'if' ?

thanks
Christian

[Eran Kampf]

From MSDN:

Although fall through from one case label to another is not supported, it is
allowed to stack case labels, for example:
case 0:
case 1:
// do something;

Eran Kampf
http://www.ekampf.com

"JuLiE Dxer" <Ms*****@verizo n.net> wrote in message
news:ub******** *************** *********@4ax.c om...

I thought fall-throughs in switch statements were not supported in C#
(design choice).

At least, that's what mentioned on page 224 of Microsoft's "Inside C#"
by Tom Archer

On Sat, 09 Oct 2004 17:32:29 GMT, "Michael C" <mi******@nospa m.org>
wrote:

Hi Chris,

We were discussing the heck out of that a few months ago, and the answer
is
(in C#), no. On the other hand, if you only have two ranges as in the
example you posted, an if...else construct would be almost as efficient.
If
you have only a couple of options per case statement, case can
drop-through
like this:

switch (i)
{
case 100:
case 101:
// do something
break;
case 1000:
case 1001:
case 1002:
// do something else
break;
}

Thanks,
Michael C., MCDBA

"Chris" <ch********@pan dora.be> wrote in message
news:o2****** *************** **@phobos.telen et-ops.be...

Hi,

can you specify a range in a switch - statement ?

switch (i)
{
case 100 - 999 :
// do something
break;
case 1000 - 9999:
// do something else
break;
}

Previous syntax is not allowed, I know,
but can you solve this using 'switch' ? without having to provide a case
statement for every possible value and without using 'if' ?

thanks
Christian

[Richard Blewett [DevelopMentor]]

Also you are aloud to transfer control from from case block to another (which gives the same functionality as fall-through, but in an obviously inteded way rather than happning by accident.

switch(i)
{
case 0:
case 1:
// do some stuff
goto case 2;
case 2:
// do some other stuff
break;
}

Regards

Richard Blewett - DevelopMentor
http://staff.develop.com/richardb/weblog

nntp://news.microsoft. com/microsoft.publi c.dotnet.langua ges.csharp/<uL************ **@TK2MSFTNGP11 .phx.gbl>

From MSDN:

Although fall through from one case label to another is not supported, it is
allowed to stack case labels, for example:
case 0:
case 1:
// do something;

Eran Kampf
http://www.ekampf.com

"JuLiE Dxer" <Ms*****@verizo n.net> wrote in message
news:ub******** *************** *********@4ax.c om...

I thought fall-throughs in switch statements were not supported in C#
(design choice).

At least, that's what mentioned on page 224 of Microsoft's "Inside C#"
by Tom Archer

On Sat, 09 Oct 2004 17:32:29 GMT, "Michael C" <mi******@nospa m.org>
wrote:

Hi Chris,

We were discussing the heck out of that a few months ago, and the answer
is
(in C#), no. On the other hand, if you only have two ranges as in the
example you posted, an if...else construct would be almost as efficient.
If
you have only a couple of options per case statement, case can
drop-through
like this:

switch (i)
{
case 100:
case 101:
// do something
break;
case 1000:
case 1001:
case 1002:
// do something else
break;
}

Thanks,
Michael C., MCDBA

"Chris" <ch********@pan dora.be> wrote in message
news:o2****** *************** **@phobos.telen et-ops.be...

Hi,

can you specify a range in a switch - statement ?

switch (i)
{
case 100 - 999 :
// do something
break;
case 1000 - 9999:
// do something else
break;
}

Previous syntax is not allowed, I know,
but can you solve this using 'switch' ? without having to provide a case
statement for every possible value and without using 'if' ?

thanks
Christian

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[microsoft.publi c.dotnet.langua ges.csharp]

[Roy Fine]

Also you are aloud to

should be "allowed to"

[Michael C]

"Fall-through" is not supported. The correct term is "Stacked case labels".
I apologize for the terminology mix-up.

Thanks,
Michael C., MCDBA

"JuLiE Dxer" <Ms*****@verizo n.net> wrote in message
news:ub******** *************** *********@4ax.c om...

I thought fall-throughs in switch statements were not supported in C#
(design choice).

At least, that's what mentioned on page 224 of Microsoft's "Inside C#"
by Tom Archer

On Sat, 09 Oct 2004 17:32:29 GMT, "Michael C" <mi******@nospa m.org>
wrote:

Hi Chris,

We were discussing the heck out of that a few months ago, and the answer is(in C#), no. On the other hand, if you only have two ranges as in the
example you posted, an if...else construct would be almost as efficient. Ifyou have only a couple of options per case statement, case can drop-throughlike this:

switch (i)
{
case 100:
case 101:
// do something
break;
case 1000:
case 1001:
case 1002:
// do something else
break;
}

Thanks,
Michael C., MCDBA

"Chris" <ch********@pan dora.be> wrote in message
news:o2******* *************** *@phobos.telene t-ops.be...

Hi,

can you specify a range in a switch - statement ?

switch (i)
{
case 100 - 999 :
// do something
break;
case 1000 - 9999:
// do something else
break;
}

Previous syntax is not allowed, I know,
but can you solve this using 'switch' ? without having to provide a case statement for every possible value and without using 'if' ?

thanks
Christian

[ambshah]

cant we use less than operator ??
case < 100
case <999
??
"Paul E Collins" <fi************ ******@CL4.org> wrote in message
news:ck******** **@sparta.btint ernet.com...

"Chris" <ch********@pan dora.be> wrote:

switch (i)
{
case 100 - 999 :

That will actually compile, but it won't do what you want. (The minus sign
is subtraction, so it's equivalent to "case -899".)

You can't specify ranges in a C# switch statement.

P.

[Jon Skeet [C# MVP]]

ambshah <am*****@hotmal e.not4spam> wrote:

cant we use less than operator ??
case < 100
case <999

No. You have to provide a single value per case.

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too