流类库13

#include<fstream>
#include<iostream>
using namespace std;
int main(int)
{
ifstream inf;
inf.open("abc.txt");
ofstream outf;
outf.open("abc_back.txt");
char c;
inf>>noskipws;
int i=1;
outf<<i<<" ";
cout<<i<<" ";
while(inf>>c)
{
if(c=='\n'){
outf<<"\n";
cout<<"\n";
outf<<++i<<" ";
cout<<i<<" ";
}
else{
outf<<c;
cout<<c;
}
}
inf.close();
outf.close();
getchar();
return 0;
}