In this article, we will discuss the difference between #define and #undef pre-processor in C language. Pre-Processor: Pre-processor is a program that performs before the… Read More
Tag Archives: Macro & Preprocessor
Pragma Directives: The pragma directive is used to control the actions of the compiler in a particular portion of a program without affecting the program… Read More
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… Read More
This directive is a special purpose directive and is used to turn on or off some features. These types of directives are compiler-specific i.e., they… Read More
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… Read More
C/C++ Preprocessor directives basics Preprocessor directives: In almost every program we come across in C/C++, we see a few lines at the top of the… Read More
As the name suggests, Preprocessors are programs that process our source code before compilation. There are a number of steps involved between writing a program… Read More
What is the output for the following code snippet? #include<stdio.h> #define A -B #define B -C #define C 5 int main() { printf("The value… Read More
#include <stdio.h> #define get(s) #s int main() { char str[] = get(GeeksQuiz); printf("%s", str); return 0; } (A) Compiler Error (B) #GeeksQuiz (C) GeeksQuiz… Read More
Output of following C program? #include<stdio.h> #define max abc #define abc 100 int main() { printf("maximum is %d", max); return 0; } (A) maximum… Read More
Predict the output of following program? #include <stdio.h> #define MAX 1000 int main() { int MAX = 100; printf("%d ", MAX); return 0; } (A)… Read More
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… Read More
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… Read More
Output? #include<stdio.h> #define f(g,g2) g##g2 int main() { int var12 = 100; printf("%d", f(var,12)); return 0; } (A) 100 (B) Compiler Error (C) 0 (D)… Read More
#include <stdio.h> #define a 10 int main() { printf("%d ",a); #define a 50 printf("%d ",a); return 0; } (A) Compiler Error (B) 10… Read More
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