Definition of Macro

Definition: In C and C++, a Macro is a piece of text that is expanded by the preprocessor part of the compiler. This is used in to expand text before compiling.

#define VALUE 10

Everywhere that VALUE is used the number of 10 will be used instead.

int fred[VALUE];

This declares an array of 10 ints.

Note: It is customary to put macros in upper case to distinguish them from variables

Glossary:

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Examples: It is better to use constants with const instead of the #define macro.