hi!
On Sun, Nov 23, 2008 at 5:07 PM, David <[EMAIL PROTECTED]> wrote: > Hello everybody, > > I recently came across a book by Prof. Langtangen: Indroduction to Computer > Programming: http://folk.uio.no/hpl/INF1100/INF1100-ebook-Aug08.pdf > > I am trying to solve exercise 1.18 ("Why does the following program not work > correctly?"), but I don't find the mistake: why does the line > > q = sqrt(b*b - 4*a*c) problem here is that the method sqrt doesn't accepts -negative numbers which in this case is the outcome of the expression above. to rectify that u can use the following q = sqrt(math.fabs(b*b - 4*a*c)) basically convert the negative number to absolute number, rest of the stuff will work. > > cause an error? I was playing around with the code, but got nowhere. > > Here the entire code: > > a = 2; b = 1; c = 2 > from math import sqrt > q = sqrt(b*b - 4*a*c) > x1 = (-b + q)/2*a > x2 = (-b - q)/2*a > print x1, x2 > > > Many thanks for a pointer! > > David > _______________________________________________ > Tutor maillist - Tutor@python.org > http://mail.python.org/mailman/listinfo/tutor > -- Regards, Arun Tomar blog: http://linuxguy.in _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
