istram to ostream

http://bbs.csdn.net/topics/300168704 <无>

#include<iostream>
#include<fstream>
using namespace std;
 
int main(int argc,char** argv)
{
    if(argc!=3)
        cout<<"Usage:程序名称 infile outfile\n";
    else
    {
        ifstream in(argv[1]);
        ofstream out(argv[2]);
        if(in && out)
            out<<in.rdbuf();
    }
    return 0;
}