C++ Part 37

I/O Stream Example :

//Reads three numbers from the file infile.txt, sums the numbers,
//and writes the sum to the file outfile.txt.
#include <fstream>
using std::ifstream;
using std::ofstream;
using std::endl;
int main( )
{
ifstream inStream;
ofstream outStream;
inStream.open("infile.txt");
outStream.open("outfile.txt");
int first, second, third;
inStream >> first >> second >> third;
outStream << "The sum of the first 3\n"
<< "numbers in infile.txt\n"
<< "is " << (first + second + third)
<< endl;
inStream.close( );
outStream.close( );
return 0;
}