讨论了pl／0语言与C语言程序在处理子过程问题上的区别，并阐述了二者的编译程序为保证语言的子过程使用规则，在编译方面处理上的异同点，主要区别是是否需要存取链来保证是否支持子过程的嵌套定义，pl／0需要使用存取链，而C语言不需要，因为C语言不支持函数的嵌套定义而Pl／0语言支持。

-Discussed the pl/0 language and C language procedures in dealing with the issue of sub-process distinction, and described the two compilers for a subset of the process to ensure that the use of language rules in the compiler on the similarities and differences between aspects of treatment, the main difference is whether there is a need access links to ensure whether or not to support the definition of nested sub-processes, pl/0 need to use the access links, while the C language does not need, because C language does not support the nested function definition of Pl/0 language support.