The header file stdio.h consists of types, macros and
functions that provide support to perform input and output operations.
Streams are not supported by this implementation. Standard functions and macros associated with streams are not present, and their use will generate an error.
The stdio.h file contains functions that use input and
output formats. The input formats, or scan formats, are used for reading data. Their
descriptions can be found under scanf, but they are also used by the
other functions in the scanf family. The output formats, or print formats, are used for
writing data. Their descriptions can be found under printf. These print
formats are also used by other printf-family functions.