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The previous chapter presented how to write programs using only System.out.println and System.out.print statements. This chapter introduces how to store, modify, and retrieve information. The medium in which information is stored is called data.
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The term data is used for both singular and plural forms. The original singular form of “data” is “datum”, but this is rarely used nowadays.
Jon Steven “Steve” Young (born October 11, 1961) is a former NFL quarterback and a sportscaster. He played 13 seasons with the San Francisco 49ers, and led the team to three Super Bowl wins. Peyton Williams Manning (born March 24, 1976) is a former NFL quarterback who played with the Indianapolis Colts and later with the Denver Broncos. He led each team to one Super Bowl win. Thomas Edward Patrick Brady Jr. (born August 3, 1977) is an NFL quarterback for the New England Patriots. He led the team to five Super Bowl wins.
Technically, a variable name can start with the underscore or the dollar sign, but the convention is to start a variable name with a lowercase letter.
Since int is the data type for specifying the position of a character letter in a character sequence, the limit on the length is 2 31 − 1.
- Using Data for Computation
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