No, actually, this is very much a bug:
#1 - gcalctool treats constants the same as the mode the calculator is 
currently in. This is okay, but it should be able to accept 6.626e-34 in that 
particular format without me having to switch it to scientific notation and 
then switch out.
#2 - even when I switch to scientific notation and enter Planck's Constant (see 
above), it becomes incorrect when I switch back to regular mode. I get no 
notification of whether or not my constant is parseable or what value it even 
represents- it sits holding my constant as if it's going to do something with 
it and the constant just disappears into the innards of the app. The actual 
*bug* part can be seen when I switch the calculator to scientific notation by 
pressing the "Sci" radio, go into the "Con" menu and pick "Edit Constants...". 
If I change something to Planck's Constant (6.626e-34, supported notation in 
gcalctool's sci mode), and try to use the constant later, it comes out as 
6.626e0, which is not even an approximation (which would be, like, 0.00 or 0.01 
or something at all), but a wrong answer.
#3  - 30 decimal places makes this calculator extremely weak compared to 
commercial-grade pocket calculators. My TI solar can do e-99 to e+99, but my 
Dual-Core can't even comprehend Planck's constant? Since this seems to be the 
flagship calculator application on gnome, I might make the suggestion to 
consider refactoring in the capability to do, at the minimum, 99 places before 
and after the decimal. Since we're not limited by display length like EEs 
addressing seven-segment displays are, it should be a lot less boring to find a 
way to display 99 places on a desktop app.

Feel free to ask follow-ups

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Gcalctool can't handle small physic constants like the Boltzmann constant
https://bugs.launchpad.net/bugs/110177
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