stringstream 기본용법

사용법 코드

#include <iostream>
#include <sstream>

using namespace std;

int main()
{
	stringstream os;
	
	//흘려주는것, 뒤에다 그냥 붙임, insert생각하면됨
	//endl도 들어감
	os << "hello world"<< endl;	// << insertion operator, >>extration operator
	//앞에있는걸 지우고 이걸로 바꾸는것
	os.str("hello world \n");

	cout << os.str() << endl;

	//extraction, 빈칸 자름
	string str;
	os >> str;
	cout << str << endl;

	//다가져옴
	str = os.str();
	cout << str << endl;

	return 0;
}

---

의문점 ( 아직 잘 모르겠음 질문만 올려둠 )

#include <iostream>
#include <sstream>

using namespace std;

int main()
{
	stringstream os;
	
	int i = 12345;
	double d = 67.89;

	os << i << ' ' << d;

	string str1;
	string str2;

	//이때는 제대로 받아옴
	os >> str1 >> str2;
	cout << str1 << ' ' << str2 << endl;

	i = 56789;
	d = 12.34;
	os.str("");
	//이때 os가 값을 받아오지 못함
	os << i << ' ' << d;

	os.str("56789 12.34");
	str1.clear(); str2.clear();
	//이때 str1, str2가 값은 받아오지 못함
	os >> str1 >> str2;

	cout << str1 << ' ' << str2 << endl;

	return 0;
}