.\" Updated & Modified 2005-09-06, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\" Updated 2008-09-16, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\"
-.TH LOG2 3 2008-08-11 "" "Linux Programmer's Manual"
+.TH LOG2 3 2010-09-12 "" "Linux Programmer's Manual"
.SH ̾Á°
log2, log2f, log2l \- Ä줬 2 ¤ÎÂпô´Ø¿ô
.SH ½ñ¼°
.BR log2 (),
.BR log2f (),
.BR log2l ():
-_XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE; or
+.RS 4
+_XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE\ >=\ 200112L;
+.br
+or
.I cc\ -std=c99
+.RE
.ad b
.SH ÀâÌÀ
.BR log2 ()
.SH ½àµò
C99, POSIX.1-2001.
.I double
-ÈǤδؿô¤Ï SVr4, 4.3BSD, C89 ¤Ë¤â½àµò¤·¤Æ¤¤¤ë¡£
+ÈǤδؿô¤Ï SVr4, 4.3BSD ¤Ë¤â½àµò¤·¤Æ¤¤¤ë¡£
.SH ´ØÏ¢¹àÌÜ
.BR cbrt (3),
.BR clog2 (3),
+.BR log (3),
+.BR log10 (3),
.BR sqrt (3)