2016-03-11 22:45:10.114636+01 by Dan Lyke 1 comments
Why display rounding can get you in trouble:
$ perl -le 'print (125.85/41.95); print int(125.85/41.95);'
3
2
$ python Python 2.7.5 (default, Nov 20 2015, 02:00:19) [GCC 4.8.5 20150623 (Red Hat 4.8.5-4)] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> print (125.85/41.95) 3.0 >>> print int(125.85/41.95) 2
[ related topics: Perl Open Source hubris ]
comments in ascending chronological order (reverse):
#Comment Re: Why display rounding can get you in made: 2016-03-12 00:25:18.821903+01 by: Dan Lyke
Courtesy of William Holmes:
echo 'public class t { public static void main(String[] args) throws Exception {
System.out.format("%.1f\n", 125.85/41.95); System.out.format("%d\n",
java.lang.Double.valueOf(125.85/41.95).intValue()); System.out.format("%d\n",
(int)java.lang.Math.round(125.85/41.95)); } }' > t.java ; javac t.java ; java -cp . t
3.0
echo 'int main(void){printf("%.1f\n", 125.85/41.95);printf("%d\n", (int)
(125.85/41.95));printf("%d\n", (int)round(125.85/41.95));}' | gcc -w -std=c99 -xc -o t - ;
./t