技術標籤：stl學習之string字串c++stl

string字串的字元存取

#include<iostream>
using namespace std;
//string字串的字元存取
void test() 
{
	string s = "dhy";
	//[]讀取字元
	//s.size(); 字串s的大小
	//s.empty()；判斷字串s是否為空
	for (int i = 0; i < s.size(); i++)
	{
		cout << s[i] << " ";
	}
	cout << endl;
 

	//at讀取字元
	for (int i = 0; i < s.size(); i++)
	{
		cout << s.at(i) << " ";
	}
	cout << endl;
	//[]修改字元
	s[0] = 'x';
	for (int i = 0; i < s.size(); i++)
	{
		cout << s[i] << " ";
	}
	cout << endl;
	//at修改字元
	s.at(0) = 'c';
	for (int i = 0; i < s.
 
size(); i++)
	{
		cout << s[i] << " ";
	}
	cout << endl;


}
int main()
{
	test();
	system("pause");
	return 0;
}