Question

Here is my code:

#include <iostream>
#include <stdlib.h>
#include <fstream>

using namespace std;

int main() {
    string line;
    ifstream inputFile;
    inputFile.open("input.txt");

    do {
        getline(inputFile, line);
        cout << line << endl;
    } while (line != "0");

    return 0;
}

input.txt content:

5 9 2 9 3
8 2 8 2 1
0

In Enclipse, it goes to infinite-loop. I’m using MinGW 5.1.6 + Eclipse CDT.

I tried many things but I couldn’t find the problem.

Answer 1

Since you are on windows try:

} while (line != "0\r");

The last line is stored as "0\r\n". The \n is used as the line delimiter by getline so the actual line read will be "0\r"

or

you can convert the dos format file to UNIX format using command

dos2unix input.txt

Now your original program should work. The command will change the \r\n at the end of the line to \n

Also you should always do error checking after you try to open a file, something like:

inputFile.open("input.txt");
if(! inputFile.is_open()) {
 cerr<< "Error opening file";
 exit(1);
}