In computer programming and formal language theory, (and other branches of mathematics), a string is an ordered sequence of symbols. These symbols are chosen from a predetermined set.In programming, when stored in memory each symbol is represented using a numeric value. A variable declared to have a string datatype usually causes storage to be allocated in memory that is capable of holding some predetermined number of symbols. When it appears in source code a string is known as a string literal and has a representation that denotes it as such. Sometimes the term binary string is used to refer to an arbitrary sequence of bits.
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