What is Fortran preprocessor?
fpp is the preprocessor used by the NAG Fortran compiler. It optionally accepts two filenames as arguments: input-file and output-file are, respectively, the input file read and the output file written by the preprocessor. By default standard input and output are used.
What is a preprocessor directive?
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 a preprocessor give an example of a preprocessor directive?
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.
Why is called preprocessor directive?
Before a C program is compiled in a compiler, source code is processed by a program called preprocessor….C Preprocessor directives:
| Preprocessor | Syntax/Description |
|---|---|
| Other directives | Syntax: #undef, #pragma #undef is used to undefine a defined macro variable. #Pragma is used to call a function before and after main function in a C program. |
What is Fortran code?
Fortran (/ˈfɔːrtræn/; formerly FORTRAN) is a general-purpose, compiled imperative programming language that is especially suited to numeric computation and scientific computing. It is a popular language for high-performance computing and is used for programs that benchmark and rank the world’s fastest supercomputers.
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 a #include preprocessor?
In C and C++, the #include preprocessor directive causes the compiler to replace that line with the entire text of the contents of the named source file (if included in quotes: “”) or named header (if included in angle brackets: <>); note that a header doesn’t need to be a source file.
Which of the following is not a preprocessor directive?
Ans: #elseif is not any preprocessor directive, but #elif is.
What is the use of preprocessor directive?
Preprocessor directives, such as #define and #ifdef , are typically used to make source programs easy to change and easy to compile in different execution environments. Directives in the source file tell the preprocessor to take specific actions.
What are the two forms of #include directive?
Here are the two types of file that can be included using #include: Header File or Standard files: This is a file which contains C/C++ function declarations and macro definitions to be shared between several source files.
Is there a way to enable preprocessing in Fortran?
Enable preprocessing. The preprocessor is automatically invoked if the file extension is .fpp, .FPP, .F, .FOR , .FTN, .F90, .F95, .F03 or .F08. Use this option to manually enable preprocessing of any kind of Fortran file.
What kind of compiler does GNU Fortran use?
Many Fortran compilers including GNU Fortran allow passing the source code through a C preprocessor (CPP; sometimes also called the Fortran preprocessor, FPP) to allow for conditional compilation. In the case of GNU Fortran, this is the GNU C Preprocessor in the traditional mode.
Do you discard comments in Fortran preprocessor?
The preprocessor does not yet recognize Fortran-style comments. Do not discard comments, including during macro expansion. This is like -C, except that comments contained within macros are also passed through to the output file where the macro is expanded.
Where does the output go in Fortran like DD?
Both kinds of output go to the standard output file. Like -dD, but emit only the macro names, not their expansions.