[engineering] calculator

Engineering Calculator is a calculator designed to be convenient and simple while including functions necessary for scientific calculations. It has a calculation function for standard engineering and a function to save past calculations. You can also decorate your own calculator theme, and make various settings related to calculations. Features include: * Save/load calculation results and formulas * Convertible to degre/radian and multiple trigonometric functions * Number of fixed point can be set * Various operations essential for calculations such as fractions and algebra * Decorate calculator theme with different colors