Task performed by preprocessor

Processes preprocessor directives and expands macros.

Remove comments and replacing them by a single space.

Divide the program into stream of tokens.

Joins any lines that end with a backslash character into a single line.

Replaces escape sequences by their equivalent internal representation.

Format of Preprocessor Directive

Preprocessor directives are special instructions for the preprocessor.

They begin with a ‘#’ which must be the first non-space character on the line.

They do not end with semicolon.

Except for some #pragma directives, preprocessor directives can appear anywhere in program.

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