⏮️Pre-Processors

Those #Tag inside our program

Preprocessors in C++ are directives that are processed before the actual compilation of your code begins. They allow you to perform certain operations on your source code before it's compiled. Here's a concise overview of preprocessors in C++:

  1. Inclusion of header files:

    #include <iostream>  // For standard library headers
    #include "myheader.h"  // For your own headers
  2. Macro definitions:

    #define PI 3.14159
    #define SQUARE(x) ((x) * (x))
  3. Conditional compilation:

    #ifdef DEBUG
      // Debug code
    #endif
  4. File inclusion guards:

    #ifndef MYHEADER_H
    #define MYHEADER_H
    // Header content
    #endif
  5. Pragma directives:

    #pragma once

These directives help with code organization, portability, and can sometimes improve performance.

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