what are the control directives of the compiler

These compiler control directives are used in different situations. They are: Situation 1 You have included a file containing some macro definitions. It is not known whether a certain macro has been defined in that header file. However, you want to be certain that the macro is defined. This situation refers to the conditional definition of a macro. We want to ensure that the macro TEST is always defined, irrespective of whether it has been defined in the header file or not. This can be achieved as follows: 1 2 3 4 #include”DEFINE.H” #ifndef TEST #define TEST 1 #endif  

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what are the control directives of the compiler
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