C++ Input/output with files

#include <iostream>
#include <fstream>

using namespace std;

int main()

    int a , b , c , d; 
 ifstream myfile;
  myfile.open ("numbers.txt");
  myfile >> a, b, c;
  d = a + b + c;
  ofstream myfile;
  myfile.open ("result.txt");
  myfile << d;
  return 0


The number.txt file contains 3 numbers 10 , 8 , 9. I am trying to get the program to read them and sum them up in the results.txt.

The errors I get are:

conflicting declaration ‘std :: ifstream myfile’

no match for ‘operator << in myfile << d’

‘myfile’ has a previous declaration as ‘std :: ifstream myfile’

Source: c++

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