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language_definition [2012/02/29 04:50] – [Constants] mhwanglanguage_definition [2012/03/17 08:56] (current) – [新语言与C/Pascal/Java的比较] marong
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   * [[contributed_functions|Contributed functions]]   * [[contributed_functions|Contributed functions]]
   * [[the_eight_queens_solver|The eight queens solver]]   * [[the_eight_queens_solver|The eight queens solver]]
-  * calculator of pi+  * [[pi_calculator|calculator of pi]]
 ====== 新语言与C/Pascal/Java的比较 ====== ====== 新语言与C/Pascal/Java的比较 ======
  
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 | 变量声明      || 任意块开始处      | 函数开始处       | 任意位置        | 函数开始处       | | 变量声明      || 任意块开始处      | 函数开始处       | 任意位置        | 函数开始处       |
 | 多维数组      || 连续存储空间 | 连续存储空间 | 数组的数组 | 数组的数组 | | 多维数组      || 连续存储空间 | 连续存储空间 | 数组的数组 | 数组的数组 |
 +| 注释      || 非嵌套 | 嵌套 | 非嵌套 | 嵌套 |
  
 +
 +改进的建议（这学期不适用）
 +
 +1. 允许全局变量
 +
 +2. 函数，变量，类型有独立的名字空间
 +
 +3. 变量将强制初始化
 +
 +4. 变量可以在块中间声明
 +
 +5. 去掉break和continue
 +
 +6. 去掉逗号表达式
 +
 +---by marong
 ====== Lexical Aspects ====== ====== Lexical Aspects ======
 A //token// can be a keyword, an identifier, a integer constant, a character constant, or a string constant. 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. Tokens are separated by whitespaces and comments.
  
-An //identifier// is a sequence of letters, digits, or underscores, which begins with a letter, 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 terminators// are ''\n'', ''\r'', and ''\r\n''.
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 //Line comments// starts with two slashes ''/''''/''. Texts behind the two slashes are ignored, until a line terminator is met. //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===== =====Constants=====
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   * ''**native** **int** readInt();''   * ''**native** **int** readInt();''
   * ''**native** **char** readChar();''   * ''**native** **char** readChar();''
-  * ''**native** **string** readString();'' 
-  * ''**native** **string** readLine();'' 
   * ''**native** **int** printInt(**int** i);''   * ''**native** **int** printInt(**int** i);''
   * ''**native** **int** printChar(**char** c);''   * ''**native** **int** printChar(**char** c);''
language_definition.1330491054.txt.gz · Last modified: 2012/02/29 04:50 by mhwang
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