[F] read_write_text-C++.cpp

#include<iostream>
#include<fstream>
#include<iomanip>
#include<sstream>

using namespace std;

int main(int argc, char** argv)
{

    if(argc!=3)
    {
        fprintf(stderr,"Usage: %s\n(1)Input_filename\n",argv[0]);
        exit(1);
    }

    ifstream ifs(argv[1]);
    ofstream ofs(argv[2]);
    string line;

    while(getline(ifs,line))
    {

        int a,b;

        istringstream is(line);

        is  >> a
            >> b;

        cout<< a <<" "<< b <<endl;
        ofs << a <<" "<< b <<endl;

    }
    ifs.close();
    ofs.close();

    return 0;
}