字符串的小技巧知识

 1 // inserting into a string
 2 #include <iostream>
 3 #include <string>
 4  
 5 int main ()
 6 {
 7   std::string str="to be question";
 8   std::string str2="the ";
 9   std::string str3="or not to be";
10   std::string::iterator it;
11  
12   // used in the same order as described above:
13   str.insert(6,str2);                 // to be (the )question
14   str.insert(6,str3,3,4);             // to be (not )the question
15   str.insert(10,"that is cool",8);    // to be not (that is )the question
16   str.insert(10,"to be ");            // to be not (to be )that is the question
17   str.insert(15,1,':');               // to be not to be(:) that is the question
18   it = str.insert(str.begin()+5,','); // to be(,) not to be: that is the question
19   str.insert (str.end(),3,'.');       // to be, not to be: that is the question(...)
20   str.insert (it+2,str3.begin(),str3.begin()+3); // (or )
21  
22   std::cout << str << '\n';
23   return 0;
24 }

string的 insert()