信息技术 程序设计语言及其环境和系统软件接口 程序设计语言扩充的APL

[中文适用范围]： 该国际标准定义了编程语言 APL 以及 APL 程序的执行环境。 其目的是促进 APL 程序和编程技能的交流和可移植性。 本国际标准规定了APL程序的语法和语义以及APL程序执行环境的特征。 它还规定了符合本国际标准的要求，包括发布实现属性的值和特征，以便可以对符合的实现进行有意义的比较。 本国际标准没有规定： ——可能随所使用的特定设备或操作系统而变化的实现属性； ——实施限制所需的值，例如 APL 工作空间大小或数字精度； ——用于表示 APL 对象的数据结构； ——通过共享变量可用的设施。 [外文原描述]： This International Standard defines the programming language APL and the environment in which APL programs are executed. Its purpose is to facilitate interchange and promote portability of APL programs and programming skills. This International Standard specifies the syntax and semantics of APL programs and the characteristics of the environment in which APL programs are executed. It also specifies requirements for conformance to this International Standard, including the publication of values and characteristics of implementation properties so that conforming implementations can be meaningfully compared. This International Standard does not specify: ? implementation properties that are likely to vary with the particular equipment or operating system used; ? required values for implementation limits such as APL workspace size or numeric precision; ? the data structures used to represent APL objects; ? the facilities available through shared variables.