Performs formatted output from the standard output (stdout). See Chapter 2 for information on format specifiers.
#include <stdio.h> int printf (const char *format_spec, . . . );
If no conversion specifications are given, you may omit the output sources. Otherwise, the function call must have exactly as many output sources as there are conversion specifications, and the conversion specifications must match the types of the output sources.
Conversion specifications are matched to output sources in left-to- right order. Excess output pointers, if any, are ignored.
| x | The number of bytes written. |
| Negative value | Indicates that an output error occurred. The function sets errno. For a list of errno values set by this function, see fprintf in this section. |