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use double instead of mrb_float (that may be single precision float) to reduce errors

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This commit is contained in:
Yukihiro "Matz" Matsumoto
2014-02-17 10:20:58 +09:00
parent eacdcc13d8
commit 57b7f6b619
1 changed files with 4 additions and 5 deletions
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src/numeric.c
+4 -5
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@@ -18,7 +18,6 @@
#define floor(f) floorf(f)
#define ceil(f) ceilf(f)
#define fmod(x,y) fmodf(x,y)
#define pow(x,y) powf(x,y)
#define FLO_MAX_DIGITS 7
#define FLO_EPSILON FLT_EPSILON
#else
@@ -110,14 +109,14 @@ num_div(mrb_state *mrb, mrb_value x)
mrb_value
mrb_flo_to_str(mrb_state *mrb, mrb_value flo)
{
mrb_float n;
double n;
int max_digits = FLO_MAX_DIGITS;
if (!mrb_float_p(flo)) {
mrb_raise(mrb, E_TYPE_ERROR, "non float value");
}
n = mrb_float(flo);
n = (double)mrb_float(flo);
if (isnan(n)) {
return mrb_str_new_lit(mrb, "NaN");
@@ -159,8 +158,8 @@ mrb_flo_to_str(mrb_state *mrb, mrb_value flo)
/* puts digits */
while (max_digits >= 0) {
mrb_float weight = pow(10.0, m);
mrb_float fdigit = n / weight;
double weight = pow(10.0, m);
double fdigit = n / weight;
if (fdigit < 0) fdigit = n = 0;
if (m < -1 && fdigit < FLO_EPSILON) {