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[iapetus]

Here's a Java class with one line, which declares a local variable called x, replaced with a comment.

public class Test {
  public static void main(String[] args) {
    // Missing line of code declaring local variable x...
    System.out.println("Test starting...");
    if (x != x) {
      System.out.println("Unpossible!");
    }
    System.out.println("Test finished.");
  }
}

Compiling and running the class gives the following output:

Test starting...
Unpossible!
Test finished.

What is the missing line?

If you can't work out the answer immediately, a secondary question: what can you say about the data type of x?

 

[maharg]

Does Java have a floating point type with a NaN value?

[edit] after looking it up, it does and it does:

public class Test {
  public static void main(String[] args) {
    float x = Float.NaN;
    System.out.println("Test starting...");
    if (x != x) {
      System.out.println("Unpossible!");
    }
    System.out.println("Test finished.");
  }
}

 

[iapetus]

Got it in one. float x = Float.NaN; does the trick.

So much for the reflexivity of the == operator (and by extension, most equals() methods for classes storing floating point values).

 

[RevenantKioku]

Spoiler

float x = Float.NaN;

Although I wasn't the one who realized the right java code, someone next to me knew that.

 

[Diablos]

Java sucks.

 

[maharg]

Java sucks.

I hope you don't mean because of this, because then every language with an IEEE conforming floating point type sucks

 

[iapetus]

No, Java is his favourite band...

 

[Diablos]

No, Java is his favourite band...

har har har.