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[Bug 275645] Re: xcalc has order-of-operations problems


If it were by design, what would be the calculation order rule?
It calculates 2*2^2+2 so that + has higher precedence than *.
On the other hand, it calculates 2*2²+2, 2+2*2^2 and 2*2+2 so that * has higher precedence than +.
This is a bug.

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  xcalc has order-of-operations problems

Status in x11-apps package in Ubuntu:

Bug description:
  Binary package hint: x11-apps

  Under Ubuntu 8.04.1, running the version in x11-apps_7.3+1_i386.deb,
  the calculator program xcalc has problems with the order of

  To recreate this bug, run "xcalc" from the command line, then type
  "2*2^2+2=". The result displayed should be "10", but instead it is
  "12". Note that "2+2*2^2=", "2^2*2+2=", "(2*2^2)+2=", and "2*(2^2)+2="
  each give the correct result.

  My guess is that the program has problems when it must close two
  levels of implicit grouping at once. In effect, it treats the
  problematic input above as if it were "2*(2^2+2)=". This
  interpretation is consistent with other examples that I've tried.

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