Basia :
I need help with writting a program, which will read me a file in Java and then split the words and will count the average of notes. So I have a file in Java called dziennik.txt and there in two lines I have a name, surname, the number of notes and then the notes of a student. It looks like this:
Mark Stank 3 4 5 6
Veronica Lee 2 2 4
So what I need to do is split words so that program will know that the 3 word is a number of notes and the next ones are these notes and it will count the average. For now I have sth like this:
import java.io.*;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Scanner;
public class FileWrite {
public static void main(String[] args) throws IOException {
StringBuilder dziennik = new StringBuilder();
try (BufferedReader br = Files.newBufferedReader(Paths.get("dziennik.txt"))) {
// read line by line
String line;
while ((line = br.readLine()) != null) {
dziennik.append(line).append("\n");
String[] pair = line.split(" ");
}
} catch (IOException e) {
System.err.format("IOException: %s%n", e);
}
System.out.println(dziennik);
}
}
I am new to this, so please explain this to me as simple as it can be .
Agile :
Similar to what spork mentioned. Here's a way to get the average number of notes per student:
StringBuilder dziennik = new StringBuilder();
double total = 0; // Added line
double counter = 0; // Added line
try (BufferedReader br = Files.newBufferedReader(Paths.get("dziennik.txt"))) {
// read line by line
String line;
while ((line = br.readLine()) != null) {
dziennik.append(line).append("\n");
String[] pair = line.split(" ");
total = total + Double.valueOf(pair[2]); // Added line
counter++; // Added line
}
System.out.println("Average number of notes per student: " + total / counter); // Added line
} catch (IOException e) {
System.err.format("IOException: %s%n", e);
}
System.out.println(dziennik);
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