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cpp-macros

11 posts

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

Macros and its types in C

Last Updated: 13 May 2025

In C programming, a macro is a symbolic name or constant that represents a value, expression, or code snippet. They are defined using the #define directive, and when encou...read more

Header Guard in C++

Last Updated: 02 November 2020

Header Guards in C++ are conditional compilation directives that help to avoid errors that arise when the same function or variable is defined more than once by the mistak...read more

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Programming Language

Output of the Program | Use Macros Carefully!

Last Updated: 21 June 2022

Predict the output of the below program C++ #include iostreamusing namespace std;#define square(x) x*xint main() { int x; x = 36 / square(6); cout x; r...read more

Interesting Facts about Macros and Preprocessors in C

Last Updated: 10 January 2025

In a C program, all lines that start with # are processed by preprocessor which is a special program invoked by the compiler. by this we mean to say that the ‘#’ symbol is...read more

Interesting-Facts

A C Programming Language Puzzle

Last Updated: 21 June 2018

Give a = 12 and b = 36 write a C function/macro that returns 3612 without using arithmetic, strings and predefined functions.We strongly recommend you to minimize your br...read more

C-Macro & Preprocessor

Macros vs Functions

Last Updated: 22 June 2022

A macro is a name given to a block of C statements as a pre-processor directive. Being a pre-processor, the block of code is communicated to the compiler before entering i...read more

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Difference between #define and const in C

Last Updated: 02 January 2025

In C, both #define and const define constant values, but these constants differ greatly in their behaviors and implementation. #define is a preprocessor directive used to ...read more

C-Macro & Preprocessor

How to print a variable name in C?

Last Updated: 02 January 2025

Printing a variable name means printing the identifier that is assigned to the variable. To print it, it should be in the form of string. This can be done by using stringi...read more

C-Macro & Preprocessor

C Preprocessor Directives

Last Updated: 21 May 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

When to Use Enum Instead of Macro in C++?

Last Updated: 18 March 2024

In C++, both enums and macros are used to define symbolic names for a set of values. However, there are certain situations where using an enum is more beneficial than usin...read more