Declare macro

/*OBJECT-LIKE MACRO*/
//Assigns the macro FOO to the value bar in the c preprocessor
#define FOO bar

//Example:
#define STRING "Hello, world!"
printf(STRING);
//Prints Hello, world! to the console

/*FUNCTION-LIKE MACRO*/
#define FOO() bar()

//Example:
#define PRINT() printf("Hello, world!")
PRINT();
//Prints out Hello, world!