FileOutStream is only for images, videos and binary data?

Question about the task

Under discussion

I am a bit confused with this task. I have not found yet something that reads numbers in a file. Do I have to take the bytes, change them into numbers and then round them, turn them back into bytes and store them? How do I know the representation of the number in bytes? Thanks for your help!

Read 2 file names from the console.
The first file contains real (fractional) numbers, separated by spaces. For example, 3.1415.
Round the numbers to integers and write them, separated by spaces, to the second file.
Close the streams.

The rounding should work like this:
3.49 => 3
3.50 => 4
3.51 => 4
-3.49 => -3
-3.50 => -3
-3.51 => -4

Requirements:

The program should read a file name twice from the console.
Create an input stream for the first file. Create an output stream for the second file.
Read the numbers from the first file, round them, and write them to the second file, separated by spaces.
The rounding must be performed as indicated in the task.
The file streams must be closed.

package com.codegym.task.task18.task1820; /* Rounding numbers */ import java.io.*; public class Solution { public static void main(String[] args) throws FileNotFoundException, IOException { BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); String fn1 = reader.readLine(); String fn2 = reader.readLine(); FileInputStream inputStream = new FileInputStream(fn1); FileOutputStream outputStream = new FileOutputStream(fn2); while(inputStream.available()>0){ int data = inputStream.read(); } outputStream.close(); inputStream.close(); } }

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Nithin

Level 35 , Hyderabad, India

23 August 2019, 07:32

Actually you need to do it as you described but you can simplify it using strings. 1) take a byte array and store all the values you read in it. 2) pass this byte array to string constucter to get string 3) split it using space as a delimiter. 4) now you will have numbers stored in string array. iterate through each string and parse them to numbers do the logic to round them. 5) After rounding them you don't need to convert them back to bytes if you use 'Filewriter' instead of FileOutputStream. just append the values to a string builder and and pass the result string to write method.

FileInputStream fis = new FileInputStream(fn1);
        FileWriter writer = new FileWriter(fn2);
        byte[] arr = new byte[fis.available()];
        fis.read(arr);
        String data = new String(arr);
        String[] num = data.split(" ");
        StringBuilder sb = new StringBuilder();
        for (String s : num) {
            double d = Double.parseDouble(s);
            int n = (int) Math.round(d);
            sb.append(n).append(" ");
        }
        sb.deleteCharAt(sb.length() - 1);
        writer.write(sb.toString());

Vahan

Level 41 , Tbilisi, Georgia

24 October 2019, 07:49

wow, what a comprehensive hint