2018-03-16



Rounding errors of floats in awk:

     :-Q awk 'BEGIN{ CONVFMT="%.2f"; print 408.59 + 1000; }'
     1408.59

     :-Q awk 'BEGIN{ CONVFMT="%.2f"; print 408.59 + 10000; }'
     10408.6

     :-Q awk 'BEGIN{ CONVFMT="%.2f"; print 408.59 + 100000; }'
     100409

This is a nice example of how quickly you can run into them, even
without fancy calculations!

And a solution by using bc(1) from within awk:

     "echo \"scale=2; " sum " + " $3 "\" | bc -q" | getline sum

[0]


[0]  https://debianforum.de/forum/viewtopic.php?f=34&t=169026&p=1168239#p1168239


http://marmaro.de/lue/        markus schnalke <meillo@marmaro.de>