java switch case

[aconti]

Hello,

can I specify a range for each case example:

case 1 - 3:{

System.out.print("Very low mark"); }


Thanks

[Junky]

In some languages you can but in Java you cannot. What you do instead is omit the break statement.

switch number {
    case 1:
    case 2:
    case 3:
        // do stuff
        break;
    case 4:
    case 5:
        // etc
}

[JosAH]

No, Java (nor C++ nor C) alloq that notation; you have to list each possibility separate, e.g.

switch (x) {
   case 1:
   case 2:
   case 3: ...

This is undoable for large ranges and you have to change your statement to a sequence of if-else-if-else ... statements.

kind regards,

Jos

edit: Monday morning and too slow again ...

[aconti]

but I have all these different values:

0 - 49.5
50 - 59.5

and so on...

so I will use the if else statement

[Junky]

Yep, if you have too many cases then an if statement is a better choice.

[aconti]

thanks a lot very quick !

[JosAH]

but I have all these different values:

0 - 49.5
50 - 59.5

and so on...

so I will use the if else statement

Yep, that's the procedural approach; you could try a more object oriented approach: define a class (type) Range and store your Range objects in a Map<Range, Runnable>. If a Range is found you can run the associated Runnable. You could give it a try ...

kind regards,

Jos

[stchman]

Hello,

can I specify a range for each case example:

case 1 - 3:{

System.out.print("Very low mark"); }


Thanks

Since the case only works with int variables use if statements, it will work on many types. Also if you have a MUCH larger range the case statements will be many.

number is type double in the example below.

if( number >= 1.0 || number <= 40.0 )
    System.out.println( "Very low mark" );
if( number >= 41.0 || number <= 70.0 )
    System.out.println( "Low mark" );
if( number >= 71.0 || number <= 100.0 )
    System.out.println( "Better mark" );

[Junky]

Looks like I actually helped someone in this thread. Are you happy now?

[stchman]

Yes, and you even managed to curb your urge to berate them as well. There might be hope yet.

[JosAH]

if( number >= 1.0 || number <= 40.0 )
    System.out.println( "Very low mark" );
if( number >= 41.0 || number <= 70.0 )
    System.out.println( "Low mark" );
if( number >= 71.0 || number <= 100.0 )
    System.out.println( "Better mark" );

Please check your code before you post it. You want && instead of ||

kind regards,

Jos

[anthropamorphic]

I think you could probably do
case > 0; case < 4:

just a guess, but it might work

[Junky]

Don't make guesses and provide incorrect advice. Try it yourself first before posting.

[JosAH]

I think you could probably do
case > 0; case < 4:

just a guess, but it might work

If you´re not sure whether or not your suggestion is correct, you should try it; your suggestion is not correct.

kind regards,

Jos

[anthropamorphic]

If you´re not sure whether or not your suggestion is correct, you should try it; your suggestion is not correct.

kind regards,

Jos

I Dont have the means to try it right now so my bad, but I don't know what I was think it would probably be something more like an and symbol instead of ;
Case > 0 & case < 4:

[JosAH]

I Dont have the means to try it right now so my bad, but I don't know what I was think it would probably be something more like an and symbol instead of ;
Case > 0 & case < 4:

Don't guess; Java (nor C, nor C++) work that way.

kind regards,

Jos

[Junky]

WTF?

Did you bother to read any of the replies before you posted?

In Java YOU CANNNOT USE RANGES IN A SWITCH STATEMENT. So just stop making wild guesses when you don't have a clue what you are talking about.