From 7c3537f27dd9edd5c8ff3cfa4aa2748abd975f44 Mon Sep 17 00:00:00 2001
From: matz <matz@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Wed, 5 Jun 2002 09:54:09 +0000
Subject: [PATCH] * math.c (Init_Math): backport asin, acos, atan.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_6@2525 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ChangeLog       |  4 ++++
 lib/rational.rb |  6 +++---
 math.c          | 37 +++++++++++++++++++++++++++++++++++++
 3 files changed, 44 insertions(+), 3 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 33303fa70d..6e8a552c4c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Wed Jun  5 18:53:06 2002  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* math.c (Init_Math): backport asin, acos, atan.
+
 Tue Jun  4 00:45:50 2002  Nobuyoshi Nakada  <nobu.nokada@softhome.net>
 
 	* ext/socket/addrinfo.h: typo.
diff --git a/lib/rational.rb b/lib/rational.rb
index decf26b1ba..ff35f36a3e 100644
--- a/lib/rational.rb
+++ b/lib/rational.rb
@@ -8,7 +8,7 @@
 # --
 #   Usage:
 #   class Rational < Numeric
-#      (include Compareable)
+#      (include Comparable)
 #
 #   Rational(a, b) --> a/b
 #
@@ -47,7 +47,7 @@ class Rational < Numeric
   @RCS_ID='-$Id: rational.rb,v 1.7 1999/08/24 12:49:28 keiju Exp keiju $-'
 
   def Rational.reduce(num, den = 1)
-    raise ZeroDivisionError, "denometor is 0" if den == 0
+    raise ZeroDivisionError, "denominator is 0" if den == 0
 
     if den < 0
       num = -num
@@ -132,7 +132,7 @@ class Rational < Numeric
       den = @denominator * a.numerator
       Rational(num, den)
     elsif a.kind_of?(Integer)
-      raise ZeroDivisionError, "devided by 0" if a == 0
+      raise ZeroDivisionError, "divided by 0" if a == 0
       self / Rational.new!(a, 1)
     elsif a.kind_of?(Float)
       Float(self) / a
diff --git a/math.c b/math.c
index 2cac83e938..86c889dca9 100644
--- a/math.c
+++ b/math.c
@@ -56,6 +56,39 @@ math_tan(obj, x)
     return rb_float_new(tan(RFLOAT(x)->value));
 }
 
+static VALUE
+math_acos(obj, x)
+    VALUE obj, x;
+{
+    Need_Float(x);
+    /*
+    if (RFLOAT(x)->value < -1.0 || RFLOAT(x)->value > 1.0)
+	rb_raise(rb_eArgError, "Out of range (-1..1)");
+    */
+    return rb_float_new(acos(RFLOAT(x)->value));
+}
+
+static VALUE
+math_asin(obj, x)
+    VALUE obj, x;
+{
+    Need_Float(x);
+    /*
+    if (RFLOAT(x)->value < -1.0 || RFLOAT(x)->value > 1.0)
+	rb_raise(rb_eArgError, "Out of range (-1..1)");
+    */
+    return rb_float_new(asin(RFLOAT(x)->value));
+}
+
+static VALUE
+math_atan(obj, x)
+    VALUE obj, x;
+{
+    Need_Float(x);
+    
+    return rb_float_new(atan(RFLOAT(x)->value));
+}
+
 static VALUE
 math_exp(obj, x)
     VALUE obj, x;
@@ -140,6 +173,10 @@ Init_Math()
     rb_define_module_function(rb_mMath, "sin", math_sin, 1);
     rb_define_module_function(rb_mMath, "tan", math_tan, 1);
 
+    rb_define_module_function(rb_mMath, "acos", math_acos, 1);
+    rb_define_module_function(rb_mMath, "asin", math_asin, 1);
+    rb_define_module_function(rb_mMath, "atan", math_atan, 1);
+
     rb_define_module_function(rb_mMath, "exp", math_exp, 1);
     rb_define_module_function(rb_mMath, "log", math_log, 1);
     rb_define_module_function(rb_mMath, "log10", math_log10, 1);