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math.c: improve docs for Math.sqrt

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* math.c: [DOC] mention possibly surprising behavior of Math.sqrt
  due to floating point arithmetic; also refer to BigDecimal#sqrt.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58291 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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stomar 2017-04-09 13:30:31 +00:00
parent 1a0dbb9eaa
commit 9638295527
1 changed files with 7 additions and 0 deletions
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math.c
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@ -590,6 +590,13 @@ math_log10(VALUE unused_obj, VALUE x)
* # [8, 2.82842712474619, 8.0]
* # [9, 3.0, 9.0]
* # [10, 3.16227766016838, 10.0]
*
* Note that the limited precision of floating point arithmetic
* might lead to surprising results:
*
* Math.sqrt(10**46).to_i #=> 99999999999999991611392 (!)
*
* See also BigDecimal#sqrt.
*/
static VALUE