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A variable (pronounced /'v??r??bl/) is a symbol that stands for a value that may vary; the term usually occurs in opposition to constant, which is a symbol for a non-varying value, i.e. completely fixed or fixed in the context of use. Variables can also take on non-numerical values. In a spreadsheet, the variable lastname might stand for a customer's last name. The concepts of constants and variables are basic to all modern mathematics, science, engineering, and computer programming. In some contexts of use, the varying of variables is literal their values actually change. For instance, in imperative programming, variables are set and usually modified by the running program through explicit assignment. In a C program we can say
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