你注意一下題目的要求和輸出結果，題目要求的輸入結果：

題目的要求是three這個變量每次都要被重新賦值，并作為下一次的輸入項。但是你這里的three只是作為一個常量參加運算，因此跟題目不符合。

正確的寫法應該是：

Public?class?HelloWorld{
????public?static?void?main(String[]?args)?{
????int?one?=?10?;
????????int?two?=?20?;
????????int?three?=?0?;
????????
????????three?=?one?+?two;
????????System.out.println("three?=?one?+?two?==>?"?+?three);
????????three?+=?one;
????????System.out.println("three?+=?one?==>?"?+?three);
????????three?-=?one;
????????System.out.println("three?-=?one?==>?"?+?three);
????????three?*=?one;
????????System.out.println("three?*=?one?==>?"?+?three);
????????three?/=?one;
????????System.out.println("three?/=?one?==>?"?+?three);
????????three?%=?one;
????????System.out.println("three?%=?one?==>?"?+?three);
????????
}
}