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Data of objective Data) is (the symbol, things in computer science is to show all can input to a computer by a computer program and the floorboard of the symbol processing。 Data structure on the computer says (also called image) called data of physical structure, also called storage structure。 It includes data elements of the expression and relations said。 In the computer says the smallest unit of information is a, is called a binary (bit)。 In computers, we can use a number of bits by what formed a bit string up a data elements, usually expressed a string of a element said or nodes。 When the data element several data item was formed, a string corresponding to each item of data a string of called data domain son。 Therefore, the element or nodes were classified as data elements in the image in the computer。 Data structure form definition: a data structure name = (D, S) for the data elements of D finite collection, S is D finite collection on relation Data structure form definition: Logic structure "data structure" in the definition "relationship" index according to the logical relations between data structure, it also calls for the logical structure。 Storage structure order storage structure of data structure on the computer says called physical structure。 Also called storage structure。 Chain store structure String (string) : by zero or more characters is composed of limited sequence。 String arbitrary consecutive sequence of characters is called the son of the clause。 Contains substring of string of mainly accordingly says。 Usually call a sequence of characters in a character string for the serial Numbers in the position。 The clause in the Lord, in the place of the first clause in the Lord the position of characters to said。