Qué (quién) es fprintf - definición

INPUT/OUTPUT FUNCTIONALITY IN THE C PROGRAMMING LANGUAGE

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fprintf

<library> Variant of the C library routine printf which prints to a given stream. E.g. fprintf(stderr, "%s: can't open file "%s".", argv[0], argv[1]); which prints to the "standard error" output stream. (1995-04-25)

stdio

standard input/output

standard input/output

<programming, operating system> The predefined input/output channels which every Unix process is initialised with. Standard input is by default from the terminal, and standard output and standard error are to the terminal. Each of these channels (controlled via a file descriptor 0, 1, or 2 - stdin, stdout, stderr) can be redirected to a file, another device or a pipe connecting its process to another process. The process is normally unaware of such I/O redirection, thus simplifying prototyping of combinations of commands. The C programming language library includes routines to perform basic operations on standard I/O. Examples are "printf", allowing text to be sent to standard output, and "scanf", allowing the program to read from standard input. (1996-06-07)

Wikipedia

C file input/output

The C programming language provides many standard library functions for file input and output. These functions make up the bulk of the C standard library header <stdio.h>. The functionality descends from a "portable I/O package" written by Mike Lesk at Bell Labs in the early 1970s, and officially became part of the Unix operating system in Version 7.

The I/O functionality of C is fairly low-level by modern standards; C abstracts all file operations into operations on streams of bytes, which may be "input streams" or "output streams". Unlike some earlier programming languages, C has no direct support for random-access data files; to read from a record in the middle of a file, the programmer must create a stream, seek to the middle of the file, and then read bytes in sequence from the stream.

The stream model of file I/O was popularized by Unix, which was developed concurrently with the C programming language itself. The vast majority of modern operating systems have inherited streams from Unix, and many languages in the C programming language family have inherited C's file I/O interface with few if any changes (for example, PHP).

https://en.wikipedia.org/wiki/C file input/output