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January 31, 2007

#217: e to the pi Minus pi

e to the pi Minus pi

Person: Hey, check it out: e^pi-pi is 19.999099979. That’s weird.

Hat Guy: Yeah. That’s how I got kicked out of the ACM in college.

Person: . . . what?

Hat Guy: During a competition, I told the programmers on our team that e^pi-pi was a standard test of floating-point handlers–it would come out to 20 unless they had rounding errors.

Person: That’s awful.

Hat Guy: Yeah, they dug through half their algorithms looking for the bug before they figured it out.

{{alt text: Also, I hear the 4th root of (9^2 + 19^2

  1. is pi.