conditionals

**s_siouris** · 03-11-2008

Hi all,
I've got a question about conditionals which I couldn't find anything about it on previous posts...
I need to display 4 numbers when these are in range between min and max. I basically want to evaluate (true or false) in an "if" statement:

Code:

(min<=No1) && (max>+No1) && (min<=No2) && (max>+No2) &&(min<=No3) && (max>=No3) && (min<=No4) && (max>=No4)

I want to make this statement shorter but can you please explain why this is not working:?

Code:

(min<=No1<=max) && (min<=No2<=max) && (min<=No3<=max) && (min<=No4<=max)

Thanks!

**laserlight** · 03-11-2008

min<=No1 evaluates to a boolean value, i.e., either 0 or 1.

Therefore, min <= No1 <= max is either:
0 <= max
or
1 <= max

This is clearly different from No1 <= max.

**matsp** · 03-11-2008

becuae

Code:

min<=No1<=max

means: (min <= No1) <= max - which doesn't do the same thing that you think it does, since the result of the "min<=No1" is either 0 or 1, which is likely outside the range of No1 .. max.

You could write a function or use a macro to do it:

Code:

int within(int x, int min, int max)
{
   return (x >= min) && (x <= max);
}

or

Code:

#define WITHIN(x, min, max) (((x) >= (min)) && ((x) <= (max)))

--
Mats

**s_siouris** · 03-11-2008

this makes a lot of sense. Thank you very much!

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