Lecture4 I/O

1、File I/O

ifstream ofstream 用法和 预定义的cin、cout类似

codes：

#include<iostream> #include<fstream> #include<string> using namespace std; int main() { ifstream in; in.open("input2.txt"); ofstream out; out.open("output.txt"); string content; while(in>>content){ out<<content<<endl; } system("pause"); return 0; }