Update AssessmentPartThree.java

src/AssessmentPartThree.java

@@ -21,8 +21,13 @@ public class AssessmentPartThree {
 		 StringBuilder encoded = new StringBuilder();
 		 //This section of the code creates a new string which is equal the value of theChar
 		 String letter=String.valueOf(theChar);
-		 	//this sets the int theOffset to be equal to theOffset divided by 26 plus 26
-				theOffset = theOffset % 26 + 26;
+				 if (theOffset > 26){
+ 			theOffset = theOffset%26;  
+		}
+ 		else if (theOffset < 0)
+ 		{
+ 			theOffset = (theOffset%26)+26;
+ 		}
 	     //This section of the code creates a char called i and converts the string Letter to an array of characters
          //i is the selected character of the array
 		 for (char i :	letter.toCharArray()) {