Assuming a data file is correct (end of file is the only reason for input failur

Question

Assuming a data file is correct (end of file is the only reason for input failure), explain how these two loops differ, and why one is more reliable than the other.

  count = 0;          // no data yet
sum = 0;        // no sum yet
// read until end of file
while (!infile.eof)
{
    cin >> datum;
    count++;        // one more item
    sum += dataum;  // add to sum
}
cout << "Average of " << count
     << " scores is " << sum/count << endl;  

  count = 0;          // no data yet
sum = 0;        // no sum yet
// read until failure
//    (this loop test is false on failure)
while (cin >> datum)
{
    count++;        // one more item
    sum += dataum;  // add to sum
}
cout << "Average of " << count
     << " scores is " << sum/count << endl;  

Explanation / Answer

first loop is correct

since in second loop you're taking input from file but cin takes input from console window.

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