Prints formatted output based on an argument list. Format #include <stdio.h> int vfprintf (FILE *file_ptr, const char *format, va_list ap);
1 – Arguments
file_ptr A pointer to the file to which the output is directed. format A pointer to a string containing the format specification. For more information about format and conversion specifications and their corresponding arguments, see the "Understanding Input and Output" chapter of the HP C RTL Reference Manual. ap A list of expressions whose resultant types correspond to the conversion specifications given in the format specifications.
2 – Description
See also vprintf and vsprintf.
3 – Return Values
x The number of bytes written. Negative value Indicates an output error. The function sets errno. For a list of possible errno values set, see fprintf.