Brief description on C++ preprocessors

Question

Preprocessors

Answer 1

#include --> includes header files in your program
#define ---> substitutes macros while expansion
Refer this for more
https://googleweblight.com/i?u=https://www.tutorialspoint.com/cprogramming/c_preprocessors.htm&grqid=kPw5x5wC&hl=en-IN

Answer 2

https://googleweblight.com/i?u=https://www.geeksforgeeks.org/cc-preprocessors/&grqid=o-KxUftR&hl=en-IN