12:08 03/12/18

src/AssessmentPartThree.java

@@ -17,8 +17,27 @@ public class AssessmentPartThree {
 	// Lower case characters remain lower case, upper case remain upper case
 	// Any other characters are returned unchanged
 	  
-		 return 'a';
+	//Uppercase characters
+	if((theChar >= 65) && (theChar <= 90)) //65 to 90 = A to B
+	{
+	theChar = (char) (((theChar - 65 + theOffset) % 26) + 65);
+	}
+	//Lowercase characters
+	else if((theChar >= 97) && (theChar <= 122)) // 97 to 122 = a to b
+	{
+	theChar = (char) (((theChar - 97 + theOffset) % 26) + 97);
 	}
+	/*
+	theChar = (char) (((theChar - 97 + theOffset) % 26) + 97); formulae
+	                      (theChar - 97 - ASCII a/A to give value between 1 and 26  
+	            + theOffset) + the offset value
+	                      (                           % 26) % modulo ensures value is always between 1 and 26
+	                    (                                  + 97) + ASCII a/A to return result to ASCII char
+	              (char) result needs to be casted to char 
+	*/
+	return theChar;
+	}
+
 	 
 	public String encryptedString(String theMessage, int theOffset)
 	{
@@ -26,7 +45,19 @@ public class AssessmentPartThree {
 	// Complete this method so that it uses encryptedCharacter to 
 	// return the encrypted version of theMessage using theOffset
 	 
-		 return "Encryptred message";
+	char chaMessageArr[] = theMessage.toCharArray();
+	char[] chaResultArr = new char[chaMessageArr.length];
+	//initialising Arrays
+	  
+	for(int i = 0; i < chaMessageArr.length; i++)
+	//loop to run through each character in encrypted message
+	{
+	chaResultArr[i] = enryptedCharacter(chaMessageArr[i], theOffset);
+	//passing each character to decryption method and saving result in array
+	}
+	 
+	return (new String(chaResultArr));
+	//converting result array into string, and returning this
 	}
 	
 }