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Steven Parker225,712 Points
You need a string input variable in addition to the numeric one.
Right now, you convert the input into a number in one statement, but then later try to perform a string function and comparison on it. But if you save the string input first you can use it for that test instead of the number:
var response = Console.ReadLine(); // get the response first as a string entry = int.Parse(response); // then convert it to a number //if user types quit for first number if (response.ToLower() == "quit") // check the STRING input here instead
Of course, you'll also need to do something similar with the second entry.