# ruby/ruby

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 /********************************************************************** math.c - \$Author\$ \$Date\$ created at: Tue Jan 25 14:12:56 JST 1994 Copyright (C) 1993-2000 Yukihiro Matsumoto **********************************************************************/ #include "ruby.h" #include VALUE rb_mMath; #define Need_Float(x) (x) = rb_Float(x) #define Need_Float2(x,y) {\ Need_Float(x);\ Need_Float(y);\ } static VALUE math_atan2(obj, y, x) VALUE obj, x, y; { Need_Float2(y, x); return rb_float_new(atan2(RFLOAT(y)->value, RFLOAT(x)->value)); } static VALUE math_cos(obj, x) VALUE obj, x; { Need_Float(x); return rb_float_new(cos(RFLOAT(x)->value)); } static VALUE math_sin(obj, x) VALUE obj, x; { Need_Float(x); return rb_float_new(sin(RFLOAT(x)->value)); } static VALUE math_tan(obj, x) VALUE obj, x; { Need_Float(x); return rb_float_new(tan(RFLOAT(x)->value)); } static VALUE math_exp(obj, x) VALUE obj, x; { Need_Float(x); return rb_float_new(exp(RFLOAT(x)->value)); } #if defined __CYGWIN__ #define log(x) ((x) < 0.0 ? nan() : log(x)) #define log10(x) ((x) < 0.0 ? nan() : log10(x)) #endif static VALUE math_log(obj, x) VALUE obj, x; { Need_Float(x); return rb_float_new(log(RFLOAT(x)->value)); } static VALUE math_log10(obj, x) VALUE obj, x; { Need_Float(x); return rb_float_new(log10(RFLOAT(x)->value)); } static VALUE math_sqrt(obj, x) VALUE obj, x; { Need_Float(x); if (RFLOAT(x)->value < 0.0) rb_raise(rb_eArgError, "square root for negative number"); return rb_float_new(sqrt(RFLOAT(x)->value)); } static VALUE math_frexp(obj, x) VALUE obj, x; { double d; int exp; Need_Float(x); d = frexp(RFLOAT(x)->value, &exp); return rb_assoc_new(rb_float_new(d), INT2NUM(exp)); } static VALUE math_ldexp(obj, x, n) VALUE obj, x, n; { double d; Need_Float(x); return rb_float_new(d = ldexp(RFLOAT(x)->value, NUM2INT(n))); } void Init_Math() { rb_mMath = rb_define_module("Math"); #ifdef M_PI rb_define_const(rb_mMath, "PI", rb_float_new(M_PI)); #else rb_define_const(rb_mMath, "PI", rb_float_new(atan(1.0)*4.0)); #endif #ifdef M_E rb_define_const(rb_mMath, "E", rb_float_new(M_E)); #else rb_define_const(rb_mMath, "E", rb_float_new(exp(1.0))); #endif rb_define_module_function(rb_mMath, "atan2", math_atan2, 2); rb_define_module_function(rb_mMath, "cos", math_cos, 1); 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, "exp", math_exp, 1); rb_define_module_function(rb_mMath, "log", math_log, 1); rb_define_module_function(rb_mMath, "log10", math_log10, 1); rb_define_module_function(rb_mMath, "sqrt", math_sqrt, 1); rb_define_module_function(rb_mMath, "frexp", math_frexp, 1); rb_define_module_function(rb_mMath, "ldexp", math_ldexp, 2); }
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