Macro &amp; Preprocessor

Types of pragma directives in C

C Programs

Last Updated: 04 April 2021

Pragma Directives: The pragma directive is used to control the actions of the compiler in a particular portion of a program without affectin ...read more

C Macro

C Programs

include guards in C++

Last Updated: 17 August 2023

While programming in C++ we often use a class multiple times, and hence it requires to create a header file and just include it in the main ...read more

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#pragma Directive in C

Last Updated: 09 January 2024

In C, the #pragma directive is a special purpose directive that is used to turn on or off some features. #pragma also allows us to provide s ...read more

C Preprocessor Directives

errno constant in C++

Last Updated: 14 August 2021

errno is a preprocessor macro used for error indication.The value of errno is set to zero at program startup, and any function of the standa ...read more

Last Updated: 02 April 2025

In C programming, the preprocessor is a program that process the source code before the actual compilation begins. It uses preprocessor dire ...read more

C | Macro & Preprocessor | Question 12

Last Updated: 28 June 2021

Predict the output of following program?[sourcecode language="C"]#include stdio.h#define MAX 1000int main(){ int MAX = 100; printf(%d , ...read more

C | Macro & Preprocessor | Question 11

Last Updated: 28 June 2021

What is the use of \"#pragma once\"?(A)Used in a header file to avoid its inclusion more than once.(B)Used to avoid multiple declarations of ...read more

C | Macro & Preprocessor | Question 10

Last Updated: 12 February 2013

Which file is generated after pre-processing of a C program?(A).p(B).i(C).o(D).m Answer: (B)Explanation:After the pre-processing of a C pro ...read more

C | Macro & Preprocessor | Question 7

Last Updated: 06 February 2013

Output?[sourcecode language="C"]# include stdio.h# define scanf %s Geeks Quiz int main(){ printf(scanf, scanf); return 0;}[/sourcecode] ...read more

C | Macro & Preprocessor | Question 6

Last Updated: 28 June 2021

[sourcecode language="C"]#include stdio.h#define square(x) x*xint main(){ int x; x = 36/square(6); printf(%d, x); return 0;}[/sourcecode ...read more

C | Macro & Preprocessor | Question 5

Last Updated: 05 February 2013

[sourcecode language="C"]#include stdio.h#define ISEQUAL(X, Y) X == Yint main(){ #if ISEQUAL(X, 0) printf(Geeks); #else ...read more

C | Macro & Preprocessor | Question 14

Last Updated: 28 June 2021

What is the output of following program?[tabby title="C"][sourcecode language="c"]#include #define macro(n, a, i, m) m##a##i##n#define MAIN ...read more

C | Macro & Preprocessor | Question 2

Last Updated: 02 February 2013

[tabby title="C"][sourcecode language="c"]#include #if X == 3 #define Y 3#else #define Y 5#endifint main(){ printf(\"%d\", Y); r ...read more

C | Macro & Preprocessor | Question 1

Last Updated: 12 January 2013

[sourcecode language="C"]#include stdio.h#define PRINT(i, limit) do \ { \ if (i++ limit) ...read more