switch statements & conditionals

[linkxs]

Hi,
I'm a beginner in java. I was wondering if it's possible to have a conditional statement in a switch statement. For example:

switch(thing)
case thing<80:
i++;
break;
case thing<70:
i--;
break;

[Fubarable]

Try it and let's see what the compiler has to say about it.

[linkxs]

Heh, you have a point. I don't know why I haven't tried it yet.
I've tried googling it and looked through two java books, couldn't find anything on this.

import java.util.*;

public class test
{
	public static void main(String[] args)
	{
		int n =0;
		Scanner kbd = new Scanner(System.in);
		n = kbd.nextInt();
		
		switch (n)
		{
			case (n<10):
				System.out.println("less than 10");
				break;
			case n>10:
				System.out.println("more than 10");
				break;
		}
	}
}

javac "test.java" (in directory: C:\Users\linkxs\Desktop\tempjava)
test.java:13: incompatible types
found : boolean
required: int
case (n<10):
^
test.java:16: incompatible types
found : boolean
required: int
case n>10:
^


I'll take that as a no.

[Fubarable]

I agree with your take on it. Also when in doubt, check out what the Java Language Specification or JLS has to say about this: JLS 14.11 The Switch Statement.

It will tell you that case must be followed by a constant expression or an enum.

[linkxs]

Damn, I really wish that would be possible. Otherwise I have to do a ton of branching ifs..

[Aero]

Basicially a switch lets you choice, so if you want n>10 and n<10 and n=10 (because of default), well you have to declare all the choices. At least if I'm not mistaken.

However if I'm correct you could use this

public class test
{
	public static void main(String[] args)
	{
             Scanner kbd = new Scanner(System.in);
	     int n = kbd.nextInt();
		if (n>10)
		{
                   System.out.println("Number is more then 10 ");
	        }
                else                                                                  //n<=10
		{
                    System.out.println("Number is less than 10 or equal to 10");
                }
	}
}

Then again if your work with more and larger n's it gets really branched.

[linkxs]

Yeah, exactly, that's the issue I was having: I had a ton of branched if's, and I thought I'd put switch in there instead, but then it becomes even longer.

[chipp]

you can do it, in visual basic :))