public class helloworld{ ?public static void main(String[] args){ ? int one=10; ? int two=20; ? int three=0; ?int three = one + two; ?int three+= one; ?int three-= one; ?int three*= one; ?int three/= one; ?int three%= one; 我這個菜鳥前面寫成這樣，結果老是出錯，我想知道為什么不能這樣寫？