Irrational expressions

Question

Is there any keywords for irrationals like the result of Math.sqrt(-5) ?
I see in the output NaN, I want something like that.

Answer 1

That's not irrational, that is a complex number.

Answer 2

A complex number has the form a+b*i where a and b are real. Square root of -1 for example is i.

Answer 3

It exists. It's used a lot in physics and engineering. You need to define a class to calculate it.

Just don't pass negative values to sqrt...

Answer 4

@Helioform
So that has specific name or symbol for that, right?

Answer 5

@Helioform
Sorry, maybe it's an advanced math topic, I study in high school, we just draw a circle and cross it to show that sqrt(-1) doesn't exist.
Can I use any symbols that represent it like
if (Math.sqrt(x)==NaN) {} or I must do
if (Math.sqrt(x)!=Math.sqrt(Math.abs(x))){} to detect it?

Answer 6

Great advice for a quadratic equation solver program :)

Anyway, I will just use my sqrt!=sqrt abs