Merge pull request #55 from ensozos/Issue#54

[Bug] NaN error #54

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

@@ -127,6 +127,9 @@ class CalculatorImpl(calculator: Calculator, val context: Context) {
     }
 
     fun handleClear() {
+        if (displayedNumber.equals(NAN)) {
+            handleReset()
+        } else {
             val oldValue = displayedNumber
             var newValue = "0"
             val len = oldValue!!.length
@@ -143,6 +146,7 @@ class CalculatorImpl(calculator: Calculator, val context: Context) {
             setValue(newValue)
             mBaseValue = Formatter.stringToDouble(newValue)
         }
+    }
 
     fun handleReset() {
         resetValues()

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

@@ -13,6 +13,7 @@ val DECIMAL = "decimal"
 val CLEAR = "clear"
 val RESET = "reset"
 
+val NAN = "NaN"
 val ZERO = "zero"
 val ONE = "one"
 val TWO = "two"