《通链参考手册》


25.1.1 动态交互编码系统 Top level loop

The top level loop is the Common Lisp mechanism by which the user normally interacts with the Common Lisp system. This loop is sometimes referred to as the Lisp read-eval-print loop because it typically consists of an endless loop that reads an expression, evaluates it and prints the results.

The top level loop is not completely specified; thus the user interface is implementation-defined. The top level loop prints all values resulting from the evaluation of a form. The next figure lists variables that are maintained by the Lisp read-eval-print loop.

最近输出值查看 / // ///
最近初始值查看 *   **   ***
最近运行的程序块查看 +   ++     +++  
当前在运行的程序块 -

■图表 25-1. Variables maintained by the Read-Eval-Print Loop


【首页】【章节目录】【内容索引】【符号索引】【术语表】【设计文档】