how to use the define statement in c code example

Example 1: what is mean of define in c language

#define is a C preprocessor directive used to define macros. ... The preprocessor directives are used to provide general instruction or required data which is used inside a program. A macro is a block of code which has been given a name. Any occurance of that name is replaced by the value of the macro.

Example 2: define in c

#define CNAME value