What declaration turns the below loop into infinite loop?

Question

Place your declaration for i at line 3 so that the loop becomes an infinite loop.

public class Puzzel3 {
    public static void main(String[] args) {
        // Line 3
        while (i == i + 1) {
            System.out.println(i);
        }
        System.out.println("done");
    }
}

Answer 1

Math says, that Infinity + 1 == Infinity, so

// The declaration required
double i = Double.POSITIVE_INFINITY;

// It's infinite loop now...
while (i == i + 1) {
  System.out.println(i);
}

System.out.println("done");