#C USING FOPEN TO OPEN ANY FILE NAME UPDATE#
#C USING FOPEN TO OPEN ANY FILE NAME CODE#

On some library implementations, opening or creating a text file with update mode may treat the stream instead as a binary file.

If additional characters follow the sequence, the behavior depends on the library implementation: some implementations may ignore additional characters so that for example an additional 't' (sometimes used to explicitly state a text file) is accepted. This subspecifier forces the function to fail if the file exists, instead of overwriting it. The new C standard (C2011, which is not part of C++) adds a new standard subspecifier ('x'), that can be appended to any 'w' specifier (to form 'wx', 'wbx', 'w+x' or 'w+bx'/'wb+x'). This additional 'b' character can either be appended at the end of the string (thus making the following compound modes: 'rb', 'wb', 'ab', 'r+b', 'w+b', 'a+b') or be inserted between the letter and the '+' sign for the mixed modes ('rb+', 'wb+', 'ab+'). In order to open a file as a binary file, a 'b' character has to be included in the mode string. With the mode specifiers above the file is open as a text file. The file is created if it does not exist. Repositioning operations (fseek, fsetpos, rewind) affects the next input operations, but output operations move the position back to the end of file. Once a user-defined file is written, it can be imported anywhere in the program using the #include preprocessor.Ī+ append/update Open a file for update (both for input and output) with all output operations writing data at the end of the file. This saves the user from writing a particular function multiple times.

User-defined files: These files resembles the header files, except for the fact that they are written and defined by the user itself.

So to utilise those functions, the users need to import a few header files which define the required functions. Functions like the printf(), scanf(), cout, cin and various other input-output or other standard functions are contained within different header files.

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.

Here are the two types of file that can be included using #include:

#C USING FOPEN TO OPEN ANY FILE NAME CODE#

This type of preprocessor directive tells the compiler to include a file in the source code program. The process of importing such files that might be system-defined or user-defined is known as File Inclusion. These files are mainly imported from an outside source into the current program. This directive is read by the preprocessor and orders it to insert the content of a user-defined or system header file into the following program. #include Directive in C#include is a way of including a standard or user-defined file in the program and is mostly written at the beginning of any C/C++ program.

C using fopen to open any file name