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文件名称:ds10
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串的基本操作
设串中元素为字符型数据,编写函数实现以下操作:
(1)求子串:给定一个字符串s,求其中从指定位置start开始的,长度为len的子串,并返回。例如:s = abcdefg ,start = 2,len = 3,则截取的子串为 cde 。
(2)删除子串:给定字符串s,从第pos位开始,删除长度为len的子串。例如:s = abcdefg ,start = 2,len = 3,则删除后,s变为为 abfg 。
(3)插入子串:给定两个字符串s1和s2,及指定位置pos,将s2插入到s1的第pos之后。例如:s1 = abcdefg ,s2 = xyz ,pos=3,插入完成后,s1变为 abcdxyzefg 。
(4)串置换:给定字符串s1和s2,及指定位置pos,将s1中从第pos位开始的一段子串(长度与s2相等)用s2替换。例如:s1 = abcdefg ,s2 = xyz ,pos=3,插入完成后,s1变为 abcxyzg 。
-Basic operation string
Let the elements of character string data, write a function to achieve the following:
(1) her series: Given a string s, find which start from the beginning of the specified location, the length of len substring and returns. For example: s = abcdefg , start = 2, len = 3, then intercepted substring cde .
(2) Delete substring: Given a string s, beginning from the first position pos, delete substring of length len. For example: s = abcdefg , start = 2, len = 3, then deleted, s becomes as abfg .
(3) insert substring: Given two strings s1 and s2, and specify the location pos, s2 inserted after the first pos s1 s. For example: s1 = abcdefg , s2 = xyz , pos = 3, after the completion of insertion, s1 becomes abcdxyzefg .
(4) string substitution: Given strings s1 and s2, and specify the location pos, will be in s1 (s2 equal length) from the pos-b
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