It returns the written character written on success otherwise EOF if there is an error. The function fputc() writes the character value of the argument c to the output stream referenced by fp. Writing a Fileįollowing is the simplest function to write individual characters to a stream − There are various functions provided by C standard library to read and write a file, character by character, or in the form of a fixed length string. The EOF is a constant defined in the header file stdio.h. This function actually flushes any data still pending in the buffer to the file, closes the file, and releases any memory used for the file. The fclose(-) function returns zero on success, or EOF if there is an error in closing the file. To close a file, use the fclose( ) function. If you are going to handle binary files, then you will use following access modes instead of the above mentioned ones − The reading will start from the beginning but writing can only be appended. It creates the file if it does not exist. Opens a text file for both reading and writing. It first truncates the file to zero length if it exists, otherwise creates a file if it does not exist.
Here your program will start appending content in the existing file content. If it does not exist, then a new file is created. Opens a text file for writing in appending mode. Here your program will start writing content from the beginning of the file.
Opens an existing text file for reading purpose. Here, filename is a string literal, which you will use to name your file, and access mode can have one of the following values − Sr.No. The prototype of this function call is as follows −įILE *fopen( const char * filename, const char * mode ) This call will initialize an object of the type FILE, which contains all the information necessary to control the stream. You can use the fopen( ) function to create a new file or to open an existing file. This chapter will take you through the important calls for file management. C programming language provides access on high level functions as well as low level (OS level) calls to handle file on your storage devices. This chapter cover how C programmers can create, open, close text or binary files for their data storage.Ī file represents a sequence of bytes, regardless of it being a text file or a binary file. The last chapter explained the standard input and output devices handled by C programming language.
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