If the variable list holds the values [1, 3, 2, 7], then we make a call to list.doubleList(); then after the call it should store [1, 3, 2, 7, 1, 3, 2, 7]. Note that the list has been doubled in size by making the original order appear twice in succession.
A variable is any characteristic, amount, or quantity that can be measured or calculated. Variables can also be called data items. Age, gender, business income and expenses, country of birth, capital expenditures, grades, eye color and vehicle type are examples of variables. It is called a variable because its value can vary between data units in a population, and its value can change from time to time.
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