file_string

#include <iostream>
#include <fstream>
#include <cstring>
#include <windows.h>
using namespace std;

int main()
{
    SetConsoleCP(1251);
    SetConsoleOutputCP(1251);
    ifstream file1("file1.txt");
    ofstream file2("file2.txt");
    if (!file1)
    {
        cout<<"Error";
        return 1;
    }
    else
    {
        string word;
        cout<<"Введите слово"<<endl;
        cin>>word;
        string line;
        while(!file1.eof())
        {
            getline(file1,line);
            if (line.find(word)==string::npos)
                file2<<line<<endl;
        }
        file2.close();
        file1.close();
        return 0;
    }
}