Description: 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.
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