made some small adjustments to improve readability

src/org/rubenruiz/lox/Lox.java

@@ -77,7 +77,7 @@ public class Lox {
     public static void main(String[] args) throws IOException {
         // Improper use of lox would be if you were to give it more than one argument
         if (args.length > 1) {
-            System.out.println("Usage: loxRun [script]");
+            System.out.println("Usage: Lox [script]");
             System.exit(64);
         }
         // If you give it one argument, it assumes that it is a file

src/org/rubenruiz/lox/Scanner.java

@@ -63,7 +63,7 @@ public class Scanner {
     }
 
     public void scanToken() {
-        char c = advance();
+        char currentChar = advance();
         // This converts the incoming char to a token and adds it to the list
         // We started with the single character tokens as they are the easiest
         // Then, we moved on to the potentially double character ones
@@ -75,7 +75,7 @@ public class Scanner {
         //                  without having to specify every numeral)
         // Finally, a catchall that throws an error if it doesn't recognize
         // the symbol
-        switch (c){
+        switch (currentChar){
             case '(': addToken(LEFT_PAREN); break;
             case ')': addToken(RIGHT_PAREN); break;
             case '{': addToken(LEFT_BRACE); break;
@@ -114,10 +114,10 @@ public class Scanner {
             default:
                 // Check if it is a numeral first and if not, then throw the error
                 // Then check if it is an identifier and if not, then throw the error
-                if (isDigit(c)) {
+                if (isDigit(currentChar)) {
                     number();
                 }
-                else if (isAlpha(c)){
+                else if (isAlpha(currentChar)){
                     identifier();
                 }
                 else {