C++ 读写文件 实例

#include <fstream>
#include <iostream>

using namespace std;

int main()
{
	ofstream outfile("output.txt", ios::out);
	if(outfile.is_open() == true)
	{
		outfile << "first line!" << endl;
		outfile << "second line!" << endl;
		outfile << "last line!" << endl;
	}

	outfile.close();

	return 0;
}

#include <fstream>
#include <iostream>
#include <string>

using namespace std;

int main()
{
	ifstream infile("output.txt", ios::in);
	if(infile.is_open() == true)
	{
		string line;
		while(infile.eof() == false)
		{
			getline(infile, line);
			cout << line << endl;
		}
	}

	infile.close();

	return 0;
}