Differences

This shows you the differences between two versions of the page.

--- language_definition [2012/03/08 13:55] – [Lexical Aspects] mhwang
+++ language_definition [2012/03/17 08:56] (current) – [新语言与C/Pascal/Java的比较] marong
@@ Line 17: / Line 17: @@
 | 注释      || 非嵌套 | 嵌套 | 非嵌套 | 嵌套 |
+改进的建议（这学期不适用）
+. 允许全局变量
+. 函数，变量，类型有独立的名字空间
+. 变量将强制初始化
+. 变量可以在块中间声明
+. 去掉break和continue
+. 去掉逗号表达式
+---by marong
 ====== Lexical Aspects ======
 A //token// can be a keyword, an identifier, a integer constant, a character constant, or a string constant.
 Tokens are separated by whitespaces and comments.
-An //identifier// is a sequence of letters, digits, or an underscores, which begins with a letter or underscore, and does not share its name with a keyword.
+An //identifier// is a sequence of letters, digits, or underscores, which begins with a letter and does not share its name with a keyword.
-Case is significant in identifiers.
+Note that (i) identifiers cannot start with underscores, and (ii) case is significant in identifiers.
 //Line terminators// are ''\n'', ''\r'', and ''\r\n''.
@@ Line 32: / Line 48: @@
 //Line comments// starts with two slashes ''/''''/''. Texts behind the two slashes are ignored, until a line terminator is met.
-//Block comments// starts with a ''/*'', and ends with a ''*/''. Texts in between are ignored. Block comments may nest.
+//Block comments// starts with a ''/*'' and ends with a ''*/''. Texts in between are ignored. Block comments may nest.
 =====Constants=====
@@ Line 65: / Line 81: @@
   * ''**native** **int** readInt();''
   * ''**native** **char** readChar();''
-  * ''**native** **string** readString();''
-  * ''**native** **string** readLine();''
   * ''**native** **int** printInt(**int** i);''
   * ''**native** **int** printChar(**char** c);''