string::rfind

The position of the last occurrence in the string of the searched content.
If the content is not found, the member value npos is returned.

 

 

Example

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// string::rfind#include <iostream>#include <string>using namespace std;int main (){  string str ("The sixth sick sheik's sixth sheep's sick.");  string key ("sixth");  size_t found;  found=str.rfind(key);  if (found!=string::npos)    str.replace (found,key.length(),"seventh");  cout << str << endl;  return 0;}

Output:

The sixth sick sheik's seventh sheep's sick.

nnd，下载C/C++手册上写的很是费解

size_type rfind( const string& str, size_type index );

returns the location of the first occurrence of str in the current string, doing a reverse search from index, string::npos if nothing is found,

达人指导下，这段话啥意思没写错吧？