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Thread: Write method given a character file [JAVA]

  1. #1
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    Default Write method given a character file [JAVA]

    Hello everyone, I have to write a method that given the name of a character file containing integers, one for each line, checks if the number of positive values in the file exceeds that of negative values.
    This is what I managed to do. The problem I encounter is that it always tells me that positive values are greater than negative ones even when negative values are greater in the.txt file ... Could you help me? thank you
    public static String valori(String nomeFile){
     
       int accNeg=0;
       int accPos=0;
        try (FileInputStream bin = new FileInputStream(nomeFile);
                BufferedInputStream bis = new BufferedInputStream(bin);
                DataInputStream lettore = new DataInputStream(bis)) {
            while (lettore.available() != 0) {
                int parziale = lettore.readInt();
                if (parziale > 0) {
                    accPos++; 
                }
                    else if(parziale<0){                            
                            accNeg++;
              }
            }  
        } catch (FileNotFoundException e) {
            System.out.println("File " + nomeFile + " non trovato");
        } catch (IOException e) {
            System.out.println("Errore: " + e.getMessage());
        }
        if(accPos>accNeg){
        return "Valori positivi maggiori di quelli negativi";
        }
        else return "Valori positivi minori o ugali di quelli negativi";
    }

  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Write method given a character file [JAVA]

    Have you printed out the values in accPos and accNeg to see what they are? What message is printed if they have the same value?

    How was the input file created? The DataInputStream class's readInt() method does not read character data and convert it to an int like the Scanner class's nextInt method does.
    Read the API doc for the readInt() method to see what it does.
    If you don't understand my answer, don't ignore it, ask a question.

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