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+%0A%EF%BB%BF/*%0A *   Crosso Scientific Calculator%0A *   hint this code under ApacheLicense%0A */%0A%0A%0A%0A%EF%BB%BFpackage com.crosso;%0A%0Aimport android.widget.Button;%0Aimport android.widget.EditText;%0A%0A/**%0A * %0A * @author Ibrahim Abdsaid Hanna %0A *         ibrahim.seniore@gmail.com%0A */%0A%0A%0Apublic class Utility %7B%0A%0A%09%0A%09%0A%09%0A%09public static String applyOperand(String formula,char c,int position)%7B%09%09%0A%09%09return formula.substring(0, position)+c+formula.substring(position, formula.length());    %0A%09%7D%0A%09%0A%09public static String applyOperand(String formula,String c,int position)%7B%09%09%0A%09%09return formula.substring(0, position)+c+formula.substring(position, formula.length());    %0A%09%7D%0A%09%0A%09%0A%09public static void reset(Button equal_btn,EditText formulaEditText,String formulaText)%7B%0A%09%09%0A%09%09if(formulaText.trim().equals(Const.ERROR) )%7B%0A%09%09%09formulaEditText.setText(%22%22);%0A%09%09%7D%0A%09%09%0A%09%09equal_btn.setText(%22%3C%3C%22);%0A%09%7D%0A%09%0A%09%0A%09%0A%7D%0A

Create Utility.java