What are Macro Substitution Directives in C programming

Macro substitution is a process where an identifier in a program is replaced by a predefined string composed of one or more tokens. The preprocessor accomplishes this task under the direction of #define statement. This statement, usually known as a macro definition takes the following form:   #define identifier string If this statement is included in the program at the beginning, then the preprocessor replaces every occurrence of the identifier in the source code by the string. Note: Care should be taken that there is no space between the # and the word define. Also there should be atleast a

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What are Macro Substitution Directives in C programming
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