C++STL-string

 string初始化及其用法：

实战：

/*  练习c++ stl string
	https://www.cnblogs.com/skyfsm/p/6934246.html
*/

#include <iostream>
#include <string>

using namespace  std;
int main()
{
	string   s1;
	string   s2(s1);

	cin >> s1;
	
	if (s1.empty())
	{
		cout << "empty" << endl;
	}
	else {
		cout << "coutine" << endl;
	}

	//迭代器遍历
	cout << "迭代器遍历" << endl;
	for (string::iterator it = s1.begin(); it != s1.end(); it++)
	{
		cout << *it << endl;
	}
	
	//下表遍历
	cout << "下表遍历" << endl;
	for (int i = 0; i <s1.size(); i++)
	{
		cout << s1[i] << endl;
	}

	//string还有一些很好用的函数，比如找子串
	string sq("heoolo sdaa ss");
	cout << sq.find("aa", 0) << endl; //返回的是子串位置。第二个参数是查找的起始位置，如果找不到，就返回string::npos
	if (sq.find("aa1", 0) == string::npos)
	{
		cout << "找不到该子串！" << endl;

	}
	system("pause");
}

参考：https://www.cnblogs.com/skyfsm/p/6934246.html

http://c.biancheng.net/stl/number/