12_2

#include <iostream>
#include <fstream>
#include <cmath>

using namespace std;

int main()
{
    string fi,fo,w1,w2,w3;
    cout<<"raspolozhenie fayla vvoda:";
    cin>>fi;
    cout<<endl;
    cout<<"raspolozhenie fayla vyvoda:";
    cin>>fo;
    cout<<endl;
    cout<<"zamenit' slovo:";
    cin>>w1;
    cout<<endl<<"na:";
    cin>>w2;
    ifstream inp;
    ofstream outp;
    inp.open(fi);
    outp.open(fo);
    while(inp>>w3){
        if(w3==w1){
            outp<<w2<<" ";
        }
        else{
            outp<<w3<<" ";
        }
    }
    return 0;
}