// Reads three numbers from the file infile.dat, sums the numbers, 
// and writes the sum to the file outfile.dat.
// Walt Savitch
// 03/14/00

#include <fstream>
using std::ifstream; using std::ofstream; using std::endl;

int main() {

    // declaring streams
    ifstream fin;
    ofstream fout;

    // opening input and output file
    fin.open("infile.dat");
    fout.open("outfile.dat");

    // reading the numbers, printing sum
    int first, second, third;
    fin >> first >> second >> third;
    fout << "The sum of the first numbers is "
	 << first + second + third
	 << endl;

    // closing streams
    fin.close();
    fout.close();
}