Checking if the number may be correctly displayed is easy: Any number with absolute value greater thanġ0 -n may be correctly shown with n decimal digits. It should use scientific notation, if the number is to small to be displayed for the decimal digits given and should use fixed point format (withĭropping of the insignificant decimal digits) otherwise. The idea is a function, that has as arguments the number to convert and the number of decimalĭigits to display. To have found the code, that should work fine in all circumstances. I tried several approaches, working more or less well.
#Display format lazarus free#
In my Free Pascal applications, I normally use a custom function RFormat to solve these problems. No issue, but results like 1.200 or 4.00 don't really The number of decimal digits displayed is fixed, what means that insignificant zeros are also displayed. Displaying numbers as fixed point format with a precision of 2Ĭan only correctly display numbers with absolute value greater than or equal to 0.01 0.009 for example being displayed as 0.Ģ. If the number is to small to be displayed with the format used, you will get a 0 displayed. ffFixed for fixed point format, or ffExponent for scientific notation. FloatToStrF converts the number to a string with formatting, one of the function's arguments being the format e.g.Problem: Possible display of more decimal digits, that you actually want. FloatToStr converts the number to a string without formatting.Having none or several significant decimal digits, and you, in your application not wanting to display them all, but only 2 or 3. What I mean, is the display of real numbers, One of the problems, that you encounter, when writing math or scientific applications, is the display of the results.
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