The #pragma preprocessor directive is used to provide additional information to the compiler. The #pragma directive is used by the compiler to offer machine or…

The #error preprocessor directive indicates error. The compiler gives fatal error if #error directive is found and skips further compilation process. C #error example Let’s…

The #else preprocessor directive evaluates the expression or condition if condition of #if is false. It can be used with #if, #elif, #ifdef and #ifndef…

The #if preprocessor directive evaluates the expression or condition. If condition is true, it executes the code otherwise #elseif or #else or #endif code is…

The #ifndef preprocessor directive checks if macro is not defined by #define. If yes, it executes the code otherwise #else code is executed, if present….

The #ifdef preprocessor directive checks if macro is defined by #define. If yes, it executes the code otherwise #else code is executed, if present. Syntax:…

The #undef preprocessor directive is used to undefine the constant or macro defined by #define. Syntax: #undef token Let’s see a simple example to define and…

The #define preprocessor directive is used to define constant or micro substitution. It can use any basic data type. Syntax: #define token value Let’s see an example…

The #include preprocessor directive is used to paste code of given file into current file. It is used include system-defined and user-defined header files. If…

A macro is a segment of code which is replaced by the value of macro. Macro is defined by #define directive. There are two types…