Introduction to Pre Processor
Many language provide the feature of pre processor. Basically pre processor is a program that processes our source program before it passed to the compiler . it can also be considered as part of the compiler that manipulates the program text before any compilation is done. Some important issue related to pre processor are.
(a) Not all languages support the capability of pre processor and nor even all the higher level languages support it. Languages like C Ada do support this feature.
Example 32. Let us consider the C pre processor. The pre processor is a collection of special statements called directives that are executed at the beginning of the compilation process. Pre processor directives usually appear at the beginning of a program., each pre processor directive begins with a # symbol. Various pre processor directive used in C are # include # define # if # elf, #else, #end if, #end if, # if def
#line and # undef .
(b) Pre processor performs many tasks like indentation line and level numbering printing each subprogram on a separate page etc.
(c) With a single key stroke or combination of two keys some pre processors can type specific keywords of the languages.
Example 33. Consider a program in Microsoft C. Whenever we want to execute this program we do so by hitting the function key F5. When we do thid pre processing compiling linking as well as execution of the program is done automatically.
(a) Some pre processors aid to include internal documentation in the program.
Example 34. Consider the Ada pre processor which provides the internal documentation to the user in the form of menus so that the user can follow its correct logic and structure.
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