Here is my code for exponentiation, for some reason the online judge always gives me a runtime error despite the fact that it works fine on every computer I've tried. Am I doing something stupid?


import java.lang.Math;
import java.io.*;
import java.util.*;
import java.util.regex.Pattern;
import java.lang.Object;
import java.math.*;
import java.lang.StringBuilder;
import java.text.*;

public class Main { 
    public static void main(String args[]) throws IOException {
        BigDecimal R;
        int n;
        BufferedReader f = new BufferedReader(new InputStreamReader(System.in));
        String y="";
        StringTokenizer st;
        StringBuffer kb=new StringBuffer(); 
        do {
            y=f.readLine();
            if(y==null) break;
            st=new StringTokenizer(y);
            y=st.nextToken();
            try {
                R=new BigDecimal(y, MathContext.UNLIMITED);
            }
            catch(Exception e) {
                R=new BigDecimal(y, MathContext.DECIMAL128);
            }
            n=Integer.parseInt(st.nextToken());
            R=R.pow(n);
            R=R.stripTrailingZeros();
            kb.append(R.toString());
            if(kb.indexOf("E")!=-1) {
                int qq= kb.indexOf("E");
                int s=Integer.parseInt(kb.substring(qq+1));
                kb.delete(qq, kb.length());
                if(s<0) {
                    s=-s; 
                    int dec=kb.indexOf(".");
                    kb.delete(dec, dec+1);
                    for(int i=0; i<s-1; i++) kb.insert(0, "0");
                    kb.insert(0, "0."); 
                }
                else {
                    int dec=kb.indexOf(".");
                    kb.delete(dec, dec+1);
                    kb.insert(dec+s, ".");
                } 
            }
            System.out.println(kb);
            kb.setLength(0);
        } while(true);
        System.exit(0);
    }
} 

• Re:Problem with "runtime error" (209) hawk 2006-05-24 11:43:01
• bugs found in the code (2236) frkstyc 2006-05-24 11:55:12