writef

fnvoid writef(alias fmt, A...)(A args) if (isSomeString!(typeof(fmt)))

Writes formatted data to standard output (without a trailing newline).

`fmt`	The format string. When passed as a compile-time argument, the string will be statically checked against the argument types passed.
`args`	Items to write.

In older versions of Phobos, it used to be possible to write:

writef(stderr, "%s", "message");

to print a message to stderr. This syntax is no longer supported, and has been superceded by:

stderr.writef("%s", "message");

fnvoid writef(Char, A...)(in Char[] fmt, A args)

ditto