cpp/io/c

The C I/O subset of the C++ standard library implements C-style stream input/output operations. The header provides generic file operation support and supplies functions with narrow and multibyte character input/output capabilities, and the  header provides functions with wide character input/output capabilities.

C streams are denoted by objects of type std that can only be accessed and manipulated through pointers of type. Each C stream is associated with an external physical device (file, standard input stream, printer, serial port, etc).