9999999999999999.0 – 9999999999999998.0

Hacker News 上的昨日热帖，求 9999999999999999.0 – 9999999999999998.0，哪种编程语言的浮点计算能给出正确答案？

Ruby:	irb(main):001:0> 9999999999999999.0 – 9999999999999998.0 2.0
Java:	public class Foo{public static void main(String args[]){System.out.println(9999999999999999.0-9999999999999998.0);}} 2.0
Python:	>>> 9999999999999999.0 – 9999999999999998.0 2.0
Rebol:	>> 9999999999999999.0 – 9999999999999998.0 == 2.0
Haskell:	Prelude> 9999999999999999.0 – 9999999999999998.0 2.0
TCL:	% expr “9999999999999999.0-9999999999999998.0” 0.0
Emacs Lisp:	ELISP> (- 9999999999999999.0 9999999999999998.0) 2.0
Common–Lisp:	[1]> (- 9999999999999999.0 9999999999999998.0) 0.0
Maxima:	(%i1) 9999999999999999.0-9999999999999998.0; (%o1)                                2.0
Google:	0
K/Q:	q)9999999999999999.0-9999999999999998.0 2f
R:	> 9999999999999999.0-9999999999999998.0 [1] 2
Erlang:	1> 9999999999999999.0-9999999999999998.0 . 2.0
C:	main(){printf(“%lf\n”,(double)9999999999999999.0-9999999999999998.0);} 2.000000
AWK:	$ awk ‘END{print 9999999999999999.0-9999999999999998.0}'</dev/null 2
GoLang:	var a = 9999999999999999.0; var b = 9999999999999998.0; fmt.Printf(“%f\n”, a-b) 2.000000
Perl:	$ perl -e ‘print 9999999999999999.0-9999999999999998.0;print “\n”;’ 2.0
Perl6:	$ perl6 -e ‘print 9999999999999999.0-9999999999999998.0;print “\n”;’ 1
Wolfram:	1
soup:	9999999999999999.0-9999999999999998.0 1

最后看看 ChatGPT 的回答：

来源：https://geocar.sdf1.org/numbers.html

本文文字及图片出自 OSC开源社区

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