Commonly used expression calculation, simple and beautiful interface, with five exquisite skins. Functions support deep nesting of brackets, re-invocation of calculation results, saving the list of calculation results to a file, and reading historical calculation results into the list. 2008.10.28 v1.8 Major update: 1. Modify interface layout, more concise and clear. 2. Add "Simplified Interface" and implement window following like JiDian Wubi, so the calculator can be used in any window. 3. Add skin-changing function, providing five skins for you to choose your favorite one. More functions are waiting for you to discover :)