C++语法小记---string类

string类

 #include <iostream>
 #include <string>

 using namespace std;

 // 实现字符串右移, 例子hello >> 2 ==> lohel
 string operator >> (const string& str, int n)
 {
     string ret = "";
     int pos = ;

     n = n % str.length();
     pos = str.length() - n;
     ret = str.substr(pos);
     ret += str.substr(, pos); //下标从0开始，包左不包右

     return ret;
 }

 int main()
 {
     string str1 = "hello";
     string str2 = "world";

     // 1.获取字符串长度(不包括'\0')
     cout << "str1.length = " << str1.length() << endl;

     // 2.字符串接续
     cout << "str1 + str2 = " << str1 + str2 << endl;

     // 3.字符串遍历
     for(int i = ; i < str1.length(); i++)
     {
         cout << str1[i] << " ";
     }
     cout <<endl;

     for(string::iterator it = str1.begin(); it != str1.end(); it++)
     {
         cout << *it << " ";
     }
     cout <<endl;

     // 4.string转化为C语言中的char*
     cout << "str1.c_str() = " << str1.c_str() <<endl;

     // 5.查找字符在字符串中的位置
     cout << "str1.find('o') = " << str1.find('o') <<endl;

     // 6.截取子串
     cout << "str1.substr(2) = " << str1.substr() <<endl;

     // 7.自己开发的接口
     cout << "str1 >> 2 = " << (str1 >> ) <<endl;

     return ;
 }