The value of a user-defined variable can be a literal or an expression. 用戶定義變數的值可以是文字或表達式。
If we could define variables in the condition, then any use of the variable would happen before the variable was defined! 如果可以在循環條件中定義變數的話，則對變數的任何使用都將發生在變數定義之前！
The value of a user-defined variable can be a literal or an expression. 用戶定義變數的值可以是文字或表達式。
If we could define variables in the condition, then any use of the variable would happen before the variable was defined! 如果可以在循環條件中定義變數的話，則對變數的任何使用都將發生在變數定義之前！
