percent added

res/layout/calc_subtraction_button.xml

@@ -8,7 +8,9 @@
 <org.solovyev.android.view.widgets.DirectionDragButton xmlns:a="http://schemas.android.com/apk/res/android"
 													   xmlns:calc="http://schemas.android.com/apk/res/org.solovyev.android.calculator"
 													   a:id="@+id/subtractionButton"
+													   calc:textUp="+…%"
 													   a:text="-"
+													   calc:textDown="-…%"
 													   calc:directionTextScale="0.5"
 													   style="?digitButtonStyle"
 													   a:onClick="digitButtonClickHandler"/>

src/main/java/org/solovyev/android/calculator/CalculatorModel.java

@@ -256,12 +256,19 @@ public enum CalculatorModel implements CursorControl, HistoryControl<CalculatorH
 
 				@Override
 				public void doOperation(@NotNull EditText editor) {
+					int cursorPositionOffset = 0;
+					final StringBuilder textToBeInserted = new StringBuilder();
+
+					if (text.equals("+…%")) {
+						textToBeInserted .append("+%");
+						cursorPositionOffset = -1;
+					} else if (text.equals("-…%")) {
+						textToBeInserted.append("-%");
+						cursorPositionOffset = -1;
+					} else {
+						textToBeInserted.append(text);
 
 						final MathType.Result mathType = MathType.getType(text, 0);
-
-					int cursorPositionOffset = 0;
-
-					final StringBuilder textToBeInserted = new StringBuilder(text);
 						switch (mathType.getMathType()) {
 							case function:
 								textToBeInserted.append("()");
@@ -274,6 +281,7 @@ public enum CalculatorModel implements CursorControl, HistoryControl<CalculatorH
 								cursorPositionOffset = -1;
 							}
 						}
+					}
 
 					editor.getText().insert(editor.getSelectionStart(), textToBeInserted.toString());
 					editor.setSelection(editor.getSelectionStart() + cursorPositionOffset, editor.getSelectionEnd() + cursorPositionOffset);

src/main/java/org/solovyev/android/calculator/CalculatorVarsActivity.java

@@ -301,7 +301,7 @@ public class CalculatorVarsActivity extends ListActivity {
 
 		if (!StringUtils.isEmpty(name)) {
 			try {
-				Identifier.parser.parse(name, new MutableInt(0), 0);
+				Identifier.parser.parse(name, new MutableInt(0), 0, null);
 				result = true;
 			} catch (ParseException e) {
 				// not valid name;