[gcj] Getting "Runtime error" as result but don't have a clue why.

[tz-yang tang]

import java.util.*;

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int t = in.nextInt();
        for (int i = 0; i < t; i++) {
            int lower = in.nextInt();
            int upper = in.nextInt();
            int chances = in.nextInt();

            while (chances > 0 && upper >= lower) {
                int num = (lower + upper) / 2;
                System.err.println("num:" + num);
                System.out.println(num);
                String result = in.next();
                if (result.equalsIgnoreCase("TOO_BIG")) {
                    System.err.println("TOO_BIG");
                    upper = num;
                } else if (result.equalsIgnoreCase("TOO_SMALL")) {
                    System.err.println("TOO_SMALL");
                    lower = num;
                } else if (result.equalsIgnoreCase("CORRECT")) {
                    System.err.println("CORRECT");
                    break;
                }
                chances--;
            }
        }
    }
}

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