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The #define directive can be used to set up symbolic replacements in the source. As with

all preprocessor operations, #define is extremely unintelligent -- it just does textual

replacement without understanding. #define statements are used as a crude way of

establishing symbolic constants.

 

#define MAX 100

#define SEVEN_WORDS that_symbol_expands_to_all_these_words

 

 

Later code can use the symbols MAX or SEVEN_WORDS which will be replaced by the text to the right of each symbol in its #define.

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