Advanced Calculator: Cientific, and unit converter

This application is divided into three parts:

     - Normal Calculator: To perform simple daily calculations;

     - Scientific Calculator: To perform complex engineering calculations;

     -Conversor of units of area, length, distance, temperature and weight as: Millimeter², Centimeter², Meter², Kilometer², Acre², Hectare², Nanometer, Millimeter, Meter, Kilometer, Inch, Foot, Yard, Celsius, Farenheit, Kelvin, Milligrams, Centigrams, Decigrams, Grams, Kilograms, Tonne, Pound and Ounce.