Preprocessor directives are lines included in a program that begin with the character #, which make them different from a typical source code text. They are invoked by the compiler to process some programs before compilation.
What is the symbol of preprocessor directive?
Preprocessor directives begin with a hash symbol (#) and do not contain the semicolon at the end as they are not statements. They are instead terminated by a new line. The #if directive compiles the code between the directives only if the specified symbol is defined.
Which is not preprocessor directives?
Explanation: #ifelse is not a preprocessor directive. #error, #pragma, #if are preprocessor directives. There is a preprocessor directive, #elif, which performs the function of else-if.
What is pre preprocessor directive?
Preprocessing is an initial phase to process text before compilation. Preprocessor directives are lines of the source file where the first non-whitespace character is # , which distinguishes them from other lines of text.
What is preprocessor directive in CPP?
The preprocessors are the directives, which give instructions to the compiler to preprocess the information before actual compilation starts. Preprocessor directives are not C++ statements, so they do not end in a semicolon (;).
What is preprocessor directives with example?
Examples of some preprocessor directives are: #include, #define, #ifndef etc. Remember that # symbol only provides a path that it will go to the preprocessor, and command such as include is processed by preprocessor program. For example, include will include extra code to your program.
What are preprocessing directives in C?
The preprocessor will process directives that are inserted into the C source code. These directives allow additional actions to be taken on the C source code before it is compiled into object code. Directives are not part of the C language itself.
Is #include A preprocessor directive?
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.
What is an example of preprocessor directives?
What are preprocessor directives explain with example?
Preprocessing directives are lines in your program that start with # . The # is followed by an identifier that is the directive name. For example, #define is the directive that defines a macro. Whitespace is also allowed before and after the # .
How do you comment preprocessing any line?
The other way to put comments in your program is to use the // symbol. Everything from the // symbol to the end of the current line is omitted from the compiled version of the program.
What is preprocessing directive in C?
