As rule the built-in styles Variables (for variables and functions) and Constants (for constants) are used in expressions that are ready for symbol transform. But sometimes it is worth to change the styles. What we can obtain it is showed in the fig. 96. The variables π and ε are constants and their style must be not Variables, but Constants. But in this case the operator float (transfer an expression to decimal fraction with floating point) stops to work. This feature (or disadvantage) can become advantage: to make the selective operation of the operator float.