class ToInfinity { public static void main(String[] args) { //write code here for (int i = start; i <= start + 1; i++) { /* there should be an infinite loop here, nothing can be changed*/ } } }

In this code, you need to define the variable start so that the loop for (int i = start; i <= start + 1; i++) runs infinitely, and the body of the loop cannot be changed.

Idea: set start to the maximum value of int (Integer.MAX_VALUE). Then the condition i <= start + 1 will always be true, because when overflow occurs, start + 1 becomes the minimum negative number, and i will never exceed this value.

Example solution:

class ToInfinity {
    public static void main(String[] args) {
        int start = Integer.MAX_VALUE;

        for (int i = start; i <= start + 1; i++) {
            // infinite loop
        }
    }
}

Explanation:

• start = 2147483647
• start + 1 overflows and becomes -2147483648
• When comparing i <= start + 1, it compares with a negative number, but i overflows upon increment and becomes negative, so the loop will never end.