printf, fprintf, dprintf, sprintf, snprintf, vprintf, vfprintf, vdprintf, vsprintf, vsnprintf - formatted output conversion

The functions in the printf() family produce
output according to a format as described below.
The functions printf() and vprintf() write output
to stdout, the standard output stream; fprintf()
and vfprintf() write output to the given output stream;
sprintf(), snprintf(), vsprintf(), and vsnprintf()
write to the character string str.