NaN - Not a Number

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• Floating point numbers, f32 or f64, can also represent a value called NaN or Not a Number.
• One way to get the number is to take the square root of -1.0.
• Most operations with a NaN result in NaN.
• Two NaN values are not equal.

• The sqrt (square root) method is not implemented for integers.

examples/numbers/not-a-number/src/main.rs

fn main() {
    let number: f32 = -1.0;
    let i = number.sqrt();
    println!("{}", i);
    let j = number.sqrt();

    println!("{}", i + 10.0);
    println!("{}", i == j);
}

NaN
NaN
false