Preprocessor Directives and Macros Mastery Hub: The Industry

s based on "The Complete C Preprocessor Directives Course 2026: From Zero to Expert!" for your "Preprocessor Directives and Macros Mastery Hub: The Industry Foundation" course: Question: Consider the following C preprocessor directives: ```c #define MAX_SIZE 100 #define SQUARE(x) ((x) * (x)) #undef MAX_SIZE #define MAX_SIZE 200 ``` If a C source file contains `int arr[MAX_SIZE]; int result = SQUARE(5);`, what will be the size of `arr` and the value of `result` after preprocessing?

In the context of C preprocessor directives, what is the primary advantage of using `#pragma once` over multiple `#ifndef`/`#define`/`#endif` guards for header files?

Consider a scenario where you have the following macro definitions: ```c #define FOO(a, b) a ## b #define BAR(x) #x ``` What will be the output of `printf("%s %d\n", BAR(FOO(pre, fix)), FOO(1, 0));` after preprocessing?