Data transfer file1 to file2 by math formula (3%==0)

 

#include<iostream>

#include<fstream>

using namespace std;

int main()

{

       int num1;

       fstream file, doc1, doc2;

       file.open("jon.txt", ios::out);

       if (!file)

       {

              cout << "file does not open";

       }

       else

       {

              cout << "file open successfully " << endl;

       }

       doc1.open("game.txt", ios::in);

       if (!doc1)

       {

              cout << "file does not open";

       }

       else

       {

              cout << "file open successfully " << endl;

       }

       doc2.open("play.txt", ios::out);

       while (!doc1.eof())

       {

              doc1 >> num1;

              if (num1 % 3 == 0)

              {

                     file << num1 << "\t";

              }

              doc2 << num1 << "\t";

       }

       doc1.close();

       file.close();

       doc2.close();

       cout << endl;

       system("pause");

}