String is a string of characters composed of numbers, letters, and underscores. Generally recorded as s=“a1a2···an” (n>=0). It is a data type that represents text in programming languages. In programming, a string is a continuous sequence of symbols or values, such as a symbol string (a string of characters) or a binary digit string (a string of binary digits).
Usually the entire string is used as the operation object, such as: finding a substring in the string, obtaining a substring, inserting a substring at a certain position in the string, deleting a substring, etc. The necessary and sufficient conditions for two strings to be equal are: the lengths are equal, and the characters at each corresponding position are equal. Assume that p and q are two strings. The operation of finding the position where q first appears in p is called pattern matching. The two most basic storage methods of strings are sequential storage and linked storage.
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