What does .eof() for fstream in C++ does?

Asked Dec 12 '17 at 14:13

Active Dec 12 '17 at 14:14

Viewed 40 times

I am trying to count the number of lines in an excel sheet with the following code

line_count = 0;
while (!GBplaces.eof()){
    string Line;
    getline(GBplaces, Line);
    cout << Line << endl;
    line_count++;
    cout << line_count << endl;
}

There are only 101 lines on the excel sheet. However, with this code I get line_count = 102, as it appears that an extra blank line is counted. Why is that so? Does .eof() not make the line counting stop when the last line is reached?

edited Dec 12 '17 at 14:14

Quentin

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asked Dec 12 '17 at 14:13

Taenyfan

1

No. It reports when you already tried to read past the end of the file. – Quentin Dec 12 '17 at 14:14
The short answer is, you don't care about the end of the file, you care about whether a line is being read. That's what you should be checking. – Retired Ninja Dec 12 '17 at 14:20
e.g. `for (string Line; getline(GBplaces, Line);) { // use line }` – Caleth Dec 12 '17 at 16:10

What does .eof() for fstream in C++ does?

0 Answers0