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Franco Torres
Asked: 2020-10-17 15:43:03 +0800 CST 2020-10-17 15:43:03 +0800 CST

I can't read all the numbers from a .txt file

  • 772

Hi, I'm trying to read a .txt with 10 million numbers, and it only reads 5 million and I really don't know where the problem is. Here is the code of the method I am using:

public double promedioDouble() throws IOException
    {
        double acumulador = 0;
        int contador = 0;
        try{
                file = new FileReader(ruta);
                reader = new BufferedReader(file);
                while(reader.readLine()!=null)
                {
                    acumulador+=Double.parseDouble(reader.readLine());
                    contador++;
                }

            }
        catch (IOException e) 
        {
              System.out.println("cant read");
        }
        finally {
            if (file != null) file.close();
        }             
        return acumulador/contador;
    }

I did a print to the counter and it only counts 5 million.

java

1 Answers

  1. Best Answer

    Note that in the loop you are doing twice reader.readLine(), so you are eating the lines 2 by 2 instead of 1 by 1, that is why the file has just been read with half the number of iterations that you expected and only performs the sum of the even rows. You would have to do something like this to fix it:

    String linea;
while((linea = reader.readLine()) != null) {
    acumulador += Double.parseDouble(linea);
    contador++;
}

    So you only read one line per iteration.

    • 4