stream

template<int P>
struct mod_int{
	using Z=mod_int;
	static int mo(int x){return x<0?x+P:x;}
	int x;
	int val()const{return x;}
	mod_int():x(0){}
	template<class T>mod_int(const T&x_):x(x_>=0&&x_<P?static_cast<int>(x_):mo(static_cast<int>(x_%P))){}
	//...
	friend istream& operator>>(istream&is,Z&x){long long y;is>>y;x=Z(y);return is;}
	friend ostream& operator<<(ostream&os,const Z&x){return os<<x.val();}
};
const int P=119<<23|1;
using Z=mod_int<P>;

#include<bits/stdc++.h>
using namespace std;
signed main(){
	ios::sync_with_stdio(false);
	ifstream fin("in.txt");
	ofstream fout("out.txt");
	fstream fio("io.txt");
	fin.tie(&fout);
	int x;
	fin>>x;	fout<<x;
	fio>>x;	fio<<x;
return 0;}

原文地址：http://www.cnblogs.com/shaojia/p/16810966.html