Macros

Lesson 58/120

Loading Lesson...

Data Structures and Algorithms C++ Fundamentals

Lesson 58/120

C++ Macros

A macro is a fragment of code which has been given a name. Whenever the name is used, it is replaced by the contents of the macro.

OBJECT-LIKE MACRO

#define PI 3.14159
#define MAX_SIZE 100

FUNCTION-LIKE MACRO

#define SQUARE(x) ((x) * (x))

int s = SQUARE(5); // Becomes ((5) * (5))

MACRO PITFALLS

Macros are simple text replacement and don't respect scope or type safety. In modern C++, prefer const for values and inline functions for logic.

Loading Lab...

Text Substitution

A macro is a fragment of code which has been given a name. Whenever the name is used, it is replaced by the contents of the macro.

OBJECT-LIKE MACRO

#define PI 3.14159
#define MAX_SIZE 100

FUNCTION-LIKE MACRO

#define SQUARE(x) ((x) * (x))

int s = SQUARE(5); // Becomes ((5) * (5))

MACRO PITFALLS

Macros are simple text replacement and don't respect scope or type safety. In modern C++, prefer const for values and inline functions for logic.