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 ```1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 ``` ``````/************************************************ math.c - \$Author\$ \$Date\$ created at: Tue Jan 25 14:12:56 JST 1994 Copyright (C) 1993-1998 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, x, y) VALUE obj, x, y; { Need_Float2(x, y); return rb_float_new(atan2(RFLOAT(x)->value, RFLOAT(y)->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)); } 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); } ``````