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I'm trying to do hex calculations, C - A, and I already changed number base to hex, but Qalculate still doesn't work.

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up vote 5 down vote accepted

It is interpreting C and A as units. (Coulombs and Amperes.)

The button where you selected “Hexadecimal” only applies when displaying the result. It doesn't affect the way the expression that you enter is parsed.

Try 0xC - 0xA.

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