Function evaluation.

[Bkmz8888]

Help please. There is a class that reads the numbers in the text file "in.txt" and assigns them to the coefficients of a, b, c, d. Next, you need to implement a class that computes the function: y = (int) (a * Math.pow (x, 2) + b * x + c * Math.pow (x, -2) + d). The result must be displayed on the screen and in the text file "out.tht." In organizing the I / O to be used try-catch mechanism to catch exceptions of type IOException. Also need to write a variant in which the main program waives the exception handling with throws.

Example of a class that reads data from a text file.

package test;
import java.io.*;
class Function {

    public static void main(String[] args) {

        FileReader reader = null;

        try {      

            reader = new FileReader( "C:/in.txt" );

            StreamTokenizer in = new StreamTokenizer( reader );

            in.parseNumbers();

            while (in.nextToken() != StreamTokenizer.TT_EOF) {         

                double a = in.nval;

                in.nextToken();

                double b = in.nval;

                in.nextToken();

                double c = in.nval;

                in.nextToken();

                double d = in.nval;

                in.nextToken();

                double begin = in.nval;

                in.nextToken();

                double end = in.nval;

                in.nextToken();

                double step = in.nval;

                System.out.println( a + " " + b + " " + c + " " + d + " | " +  begin + " " + end + " | " + step);

            }
           

        }

        catch(Exception e) {

            e.printStackTrace();

        }

        finally {

            try {

                if ( reader != null ) {

                    reader.close();

                }

            }

            catch(Exception e) {

                e.printStackTrace();

            }
}
    }

    }

content "in.txt":
1 0.2 3.4 -1 -10 10 1

-1 3.2 3.4 -1 -10 10 1

1 0.2 3.4 -1 -10 10 1

[PhQ]

I don't see what you need help with? :O
I have a feeling that you need to read through these: Lesson: Basic I/O (The Java™ Tutorials > Essential Classes) .

[DarrylBurke]

About your topic title: Java doesn't have 'functions' -- they are called methods.

db

[Bkmz8888]

I'm just learning. Java studying the third week. This job practical work that I need to pass soon. If there had been more time, I think he could and do.