LeoCalculator descriptions LeoCalculator is an application for performing calculation of mathematical expressions that could include not only basic operations but also functions & brackets. Edit box Expression has to contain a string of mathematical expression that is supposed to be calculated. It can contain: numbers in with or without decimal point & with or without a power of 10 like 1. 2e-2 or 3. E3 pi in this application is equal to 3. 141592653 basic mathematical operations + - * / power of grade operation ^ used like 2^3 = 8 brackets determining order of operation execution major functions: sin cos tan asin acos atan ln log10 exp pow10 abs sqrt. Arguments of the functions have to be an expression surrounded brackets variables determined in the edit box Definitions Edit box Expression can contain definitions of variables: variables can be any combinations of letters & numbers without spaces & reserved words: e E pi sin cos tan asin acos atan ln log10 exp pow10 abs sqrt value expressions as usual are numbers but in most cases it could be mathematical expressions too. Tip: variable expression that contains other variables should be longer than them. To perform calculation press key Enter or print letter = after expression you want to calculate. The result will appear after mark = . You can do standard manipulation with Expression edit box such as copy/paste operation. Editing Expression box just after calculation will force the disappearance of result. The main idea is that the result value has to correspond with the expression.