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src/main/java/edu/unl/cse/csce361/calculator/Calculator.java

@@ -32,7 +32,8 @@ public class Calculator {
 
         type = getToken(token, MAXIMUM_TOKEN_LENGTH);
         while (type != DONE) {
-            message = calculate(type, token);
+        	if (type != 13) message = calculate(type, token); else message = null;
+            //message = calculate(type, token);
             if (message != null) {
                 System.out.println(message);
             }