C++ 读写文件 实例

按行写文件：

#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;}

 

 

按行读文件：

#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;}