CODEWITHSUNDEEP
javatext-files
Ceejay
Ceejay

Reputation: 7267

How to count row values from file?

i am trying to read the txt file and add up row values i.e i am passing the parameters to java code. it should print the line numbers of added values

i am passing filename and int value to java program.

for ex: read.txt contains

2
2
3
4
4
6
7
7
8
8
9
0

now i am passing parameter as 5, so it should add up the rows and print the line number and it should print the line number if the sum >= 5

for ex 2+2+3 = 7 is > 5 because the last number added up is 3 and it is in line number 3 so it should print line number 3

4+4 = 8 is > 5 so it should print line number 3

6 is > 5 so it should print line number 6 because its in line number 6

and so on.. how can i do this?

here is what i have tried

code:

import java.io.*;

class CountR
{
    public static void main(String args[])
    {
        setForSum("read.txt",3);
    }

    public static void setForSum(String filename,int param2)
    {
        try
        {
            FileInputStream fstream = new FileInputStream(filename);
            BufferedReader br = new BufferedReader(new InputStreamReader(fstream));
            String strLine;
            int i = 0;
            while ((strLine = br.readLine()) != null)   
            {
                i++;
                if(param2 == Integer.parseInt(strLine))
                { 
                    System.out.println(i);
                }
            }
            in.close();
        }
        catch (Exception e)
        {
            System.err.println("Error: " + e.getMessage());
        }
    }
}

Upvotes: 0

Views: 152

Answers (1)

christopher
christopher

Reputation: 27346

First thing I've noticed, is this if statement is only going to work if you land on your specified number, exactly.

 if(param2 == Integer.parseInt(strLine))
 { 
      System.out.println(i);
 }

Should be:

 if(param2 >= Integer.parseInt(strLine))
 { 
      System.out.println(i);
 }

Secondly, you're not totalling up the values, are you? You're just reading each value, so declare some value outside of the loop:

int currentTotal = 0;

then in the loop:

currentTotal += Integer.valueOf(strLine);

THEN use currentTotal in your statement:

if(currentTotal >= Integer.parseInt(strLine))
{ 
  System.out.println("Line Number " + i);
}

And as Heuster mentioned, make sure you're resetting currentTotal back to 0 inside your if statement!

Upvotes: 1

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