Java: NaN

[mikestechs]

Hello guys, I'm starting with Java programming and i just want to ask...

If i will have this:

-----------------

a = -1,5;

b = -2,2;

 

write = Math.pow (a,b);

System.out.println(write);

 

// I'll get this 

 

Nan

-----------------

 

And i want do something like if the "program" say NaN it will write something like "impossible" or something like that.

 

I'm new in this so i tried something with if ( write == "NaN")

but that was stupid idea becouse (write) will be always number. 

 

Any ideas  ? 

[Blade of Grass]

You can use 

Double.isNaN(number)

To check if the number is NaN.

[mikestechs]

5 minutes ago, Blade of Grass said:

You can use 

Double.isNaN(number)

To check if the number is NaN.

Yes it is. But how can i do--- if result is NaN that the program will say System.out.println("Impossible to do");

[Blade of Grass]

3 minutes ago, mikestechs said:

Yes it is. But how can i do--- if result is NaN that the program will say System.out.println("Impossible to do");

System.out.println((Double.isNaN(1.0) ? "Impossible to do" : 1.0));

Not too sure exactly what you want, but Double.isNaN is a static method which returns a boolean value, so use it as a parameter in an if statement, ternary, etc. 

[mikestechs]

1 minute ago, Blade of Grass said:

System.out.println((Double.isNaN(1.0) ? "Impossible to do" : 1.0));

 

Thank you  

[Stuff_]

Is it throwing an exception on NaN? I don't recall Java, but if it's throwing an exception, you should catch it and signal the error then.

[Blade of Grass]

1 hour ago, Stuff_ said:

Is it throwing an exception on NaN? I don't recall Java, but if it's throwing an exception, you should catch it and signal the error then.

Java doesn't throw an exception on NaN. 

[vanished]

Except, this isn't impossible.  Not mathematically at least.  In fact it's not even a complex/imaginary number.  That function is obviously messed up...

[LukeTim]

12 hours ago, mikestechs said:

Hello guys, I'm starting with Java programming and i just want to ask...

If i will have this:

-----------------

a = -1,5;

b = -2,2;

 

write = Math.pow (a,b);

System.out.println(write);

 

// I'll get this 

 

Nan

-----------------

 

And i want do something like if the "program" say NaN it will write something like "impossible" or something like that.

 

I'm new in this so i tried something with if ( write == "NaN")

but that was stupid idea becouse (write) will be always number. 

 

Any ideas  ? 

 

 

Are you actually using commas (,) as decimal separators or is that just a typo on the forum? It should be points (.) anyway.

[mikestechs]

On 2/4/2016 at 1:16 PM, LukeTim said:

 

 

Are you actually using commas (,) as decimal separators or is that just a typo on the forum? It should be points (.) anyway.

Normaly using (.)