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Macro & Preprocessor

6 posts

#define vs #undef in C language

Last Updated: 23 July 2025

In this article, we will discuss the difference between #define and #undef pre-processor in C language.What are Pre-Processor Directives?Pre-processor is a program that pe...read more

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C-Macro & Preprocessor

Macro & Preprocessor

Types of pragma directives in C

Last Updated: 23 July 2025

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 as a whole. Pragm...read more

C-Macro & Preprocessor

Macro & Preprocessor

include guards in C++

Last Updated: 23 July 2025

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 program. Now, sometimes it happ...read more

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Macro & Preprocessor

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 standard C++ library are allowed to w...read more

Macro & Preprocessor

#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 some additional information or i...read more

C-Macro & Preprocessor

Macro & Preprocessor

C Preprocessor Directives

Last Updated: 04 August 2025

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

C-Macro & Preprocessor

Macro & Preprocessor