C++ 读取写入文件

#include <iostream>
#include <fstream>
using namespace std;

int main()
{
	ofstream out;
	out.open("1.txt", ios::out | ios::trunc);
	out << "Hello" << endl;
	out.close();

	ifstream in;
	in.open("1.txt");
	char data[100];
	in >> data;
	cout << data << endl;

}