The classic approach to writing code to evaluate arithmetic expressions was described by donald knuth in 1962 see resources 编写代码对算术表达式求值的经典方法由donald knuth描述于1962年(请参阅
Next , the lower and upper bound expressions are evaluated , insofar they are present ; defaults are zero and the sequence ' s length 下一步,在它们所出现的范围内,对上下限表达式求值;缺省值是零和序列长度。
First , however , we ll look at the classical algorithms for evaluating expressions , so you can see how w3eval s approach differs 不过,我们还是先看看表达式求值的经典算法,这样您就会明白w3eval方法的差异究竟有多少。
The result of evaluating the nested expression will serve as the index or key for retrieving the appropriate element of the collection or array 对嵌套表达式求值的结果将被作为下标或键,用来检索集合或数组的适当元素。
Evaluating the same expression can produce different results in the database engine if different set options are active when the query is executed 如果执行查询时启用不同的set选项,则在数据库引擎中对同一表达式求值会产生不同结果。
This article will walk you through the highlights of w3eval s functionality ; you ll be able to look at some of the code it uses to evaluate expressions 本文将让您从头至尾认识w3eval功能性的要点;您将看到一些用于表达式求值的代码。
I hope you will find w3eval to be a useful online tool for evaluating expressions in a way that is more natural than the classical method 我希望您会发现w3eval是个对表达式求值有益的在线工具,它在某种程度上比经典的方法更简单自然。
The w3eval applet can t make your trusty hp - 41 easier to use - as its name implies , it s an expression evaluator that runs only on the web W3eval applet无法让您可信赖的hp - 41更易用,正如它的名称所暗示一个只能运行于web的表达式求值程序。
When an update statement encounters an arithmetic error overflow , divide by zero , or a domain error during expression evaluation , the update is not performed 当update语句在表达式求值过程中遇到算术错误(溢出、被零除或域错误)时,则不进行更新。
Its unique ability to evaluate expressions step by step is very handy , because the user can see each step of evaluation , together with temporary results 它独特的能力(一步一步的对表达式求值)非常容易实现,因为用户能看到求值的每一步,包括临时结果。