Assume that credits is an int variable whose value is 0 or positive. Write an expression whose value is "freshman" or "sophomore" or "junior" or "senior" based on the value of credits. In particular: if the value of credits is less than 30 the expression's value is "freshman"; 30-59 would be a "sophomore", 60-89 would be "junior" and 90 or more would be a "senior".

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credits<30 ? "freshman" : (credits>29 && credits<60 ? "sophomore" : (credits>59 && credits<90 ? "junior" : (credits>=90 ? "senior" : "invalid")))

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