Data structure-4.1 strings, arrays and generalized tables

Preface-Data Structure

The data structure needs to be chewed repeatedly, and the answers to the problems encountered in the development can be obtained at any time.

string

• Definition of string A
  finite sequence of zero or more characters.
  Denoted as S='a1a2…an' (n>=0)
• String term
  • String name: S:
  • String value: A sequence of characters enclosed in single quotes.
  • Length: the number of characters in the string
  • Empty string: a string containing zero characters, 0 means.
  • Space string: A string consisting of one or more spaces.
  • Substring: A subsequence composed of any consecutive characters in a string.
  • The position of the character in the string: the serial number of the character in the sequence)
  • The position of the substring in the string: the position of the first character of the substring in the string.
  • Equal: if and only if the values ​​of the two strings are equal.
• Examples of strings
  
• String comparison