diff options
| -rw-r--r-- | numeric.c | 20 |
1 files changed, 20 insertions, 0 deletions
@@ -1964,6 +1964,11 @@ flo_prev_float(VALUE vx) * 34567.89.floor(1) #=> 34567.8 * 34567.89.floor(2) #=> 34567.89 * 34567.89.floor(3) #=> 34567.89 + * + * Note that the limited precision of floating point arithmetic + * might lead to surprising results: + * + * (0.3 / 0.1).floor #=> 2 (!) */ static VALUE @@ -2026,6 +2031,11 @@ flo_floor(int argc, VALUE *argv, VALUE num) * 34567.89.ceil(1) #=> 34567.9 * 34567.89.ceil(2) #=> 34567.89 * 34567.89.ceil(3) #=> 34567.89 + * + * Note that the limited precision of floating point arithmetic + * might lead to surprising results: + * + * (2.1 / 0.7).ceil #=> 4 (!) */ static VALUE @@ -2342,6 +2352,11 @@ float_invariant_round(double number, int ndigits, VALUE *num) * Returns the +float+ truncated to an Integer. * * Synonyms are #to_i and #to_int + * + * Note that the limited precision of floating point arithmetic + * might lead to surprising results: + * + * (0.3 / 0.1).to_i #=> 2 (!) */ static VALUE @@ -2377,6 +2392,11 @@ flo_to_i(VALUE num) * (-2.8).truncate #=> -2 * 1.234567.truncate(2) #=> 1.23 * 34567.89.truncate(-2) #=> 34500 + * + * Note that the limited precision of floating point arithmetic + * might lead to surprising results: + * + * (0.3 / 0.1).truncate #=> 2 (!) */ static VALUE flo_truncate(int argc, VALUE *argv, VALUE num) |