获取字符串的字符

#include <iostream>
#include <string>

using namespace std;

int main ()
{
//string类型不是C语言中的字符串数组
	string v1("xiaocui");

	cout << v1[0] << endl;
	cout << v1[3] << endl;

	// size_type 代替int
	for(string::size_type x = 0; x != v1.size(); ++x)
	{
		cout << v1[x] << ' ';
	}

    cout << endl;//输出是x i a o c u i

	for(string::size_type i = 2; i != v1.size(); ++i)
	{
		v1[i] = '*';
	}

	cout << v1 << endl;// 输出是xi*****

	return 0;
}