Merge pull request #207 from AlbertoPellitteri/fix-division-by-zero-bug

Fix division by zero bug

app/src/main/kotlin/com/simplemobiletools/calculator/helpers/CalculatorImpl.kt

@@ -147,6 +147,11 @@ class CalculatorImpl(calculator: Calculator, private val context: Context) {
 
         secondValue = getSecondValue()
         calculateResult()
+        if ((lastOperation == DIVIDE || lastOperation == PERCENT) && secondValue == 0.0) {
+            lastKey = DIGIT
+            return
+        }
+
         lastKey = EQUALS
     }