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public class DToH {
    public static String dtoh_ex(int num) 
      throws NumberFormatException {
	if(num<0) throw new NumberFormatException();
	if(num<16) {
	    return dtoh(num);
	} else {
	    return (dtoh_ex(num/16) + dtoh(num%16));
	}
    }
    private static String dtoh(int num) {
	String str[] = {
               "0", "1", "2", "3", "4",
               "5", "6", "7", "8", "9",
               "A", "B", "C", "D", "E", "F"};
	return str[num];
    }
}

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