turbo c 文件操作函数（Turbo C file operation function）.docVIP

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turbo c 文件操作函数（Turbo C file operation function）.doc

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turbo c 文件操作函数（Turbo C file operation function）

turbo c 文件操作函数（Turbo C file operation function） The input and output functions of the C/C++ file ---------------------------------------------------------------------- A logical device, such as a keyboard, display, printer, disk drive, etc., whose input and output can be passed through the text A piece management method is used to complete. The most used in programming is disk files, so this section focuses on Disk file based, detailed description of the Turbo C2.0 file operations function, of course, these files on the operation The function is also suitable for non disk files. In addition, Turbo C2.0 provides two classes of functions about files. A class of standard file functions is also called Buffered file function, which is a function defined by the ANSI standard. Another type is called nonstandard file function, also called non - standard function Buffered file function. These functions were first used by the UNIX operating system, but now more than MS-DOS3.0 The operating system can also be used. The following are described separately. 1.2.1 standard file function The standard file function includes functions such as opening, closing, reading and writing of files. Unlike BASIC?, The FORTRAN language consists of sequential documents and random documents, which should be defined in different ways when they are opened. Turbo C2.0 does not distinguish between these two files, but provides two sets of functions, called sequential read write function and random read Write function. First, the opening and closing of the file Any file must be opened and closed before use and after use. This is because of the operation As a system, there are limits to the number of files open at the same time, in the DOS operating system, at DEVICE .SYS defines the number of files allowed to open at the same time n (defined in files=n). N is a text that can be opened simultaneously Number of pieces, general n=20. Therefore, you should open the file before you use the file to access i