Sean Braxton
Writing a Program to calculate Circumference of planets reading from a file and writing to new file.
Posted in : Java Beginners

Hello, I would like to know how to write a program to read data from a file. Then use the numerical data within to then calculate the circumference of the planets. I then have to output the data into a new file.

The text file is Sun,860000 Mercury,4000 Venus,8000 Earth,8400 Mars,2500 Jupiter,135000 Saturn,100000 Uranus,75000 Neptune,70000 Pluto,2750

the integers represent the diameter. I have most of the code, but I am stumped when it comes to reading the file and writing to a new file. My code is as follows

package SBLab08;
import java.io.*;
import java.util.*;
import java.math.*;

/**
*
*/
public class Main {

public static void main(String[] args) throws IOException {

Scanner input = new Scanner(System.in);
int loop = 0;
while(loop==0){
System.out.print("\nPlease enter the name of the input file - ");
String Input_File = input.nextLine();
System.out.print("\nPlease specify the name of the output file - ");
String Output_File = input.nextLine();

if(Input_File.equalsIgnoreCase(Output_File)){
System.out.print("\nThe output file must be different than the input one.");
}else{ loop=1;}
Scanner IF = new Scanner(new File(Input_File));
while( IF.hasNext() ){
String Seperator = (",");
String lineFromFile = IF.nextLine();
String[] partsOfLine = lineFromFile.split( "," ); // "," should be defined as a constant

// Use partsOfLine[ 0 ] for the name.
// Calculated the circumference as Math.PI * Integer.parseInt( lineFromFile[ 1 ] );
// Both 0 and 1 can be defined as constants
// Be sure NOT to calculate circumference twice because you need it for both the
// console and file I/O.

// Perform file I/O and console I/O here.
}
java.io.File New_Planet_Info = new java.io.File(Output_File);
PrintWriter output = new PrintWriter(Output_File);
System.out.print(IF);
}

}

} Where I have the comments in my code is an area where I could use the most help. Please Help.I need to also output to the user the new data included with the original data. and for 3.14 can i just use pi since I imported the math package? My output needs to look like this:

NAME DIAMETER CIRCUMFERENCE Sun 860000 2701770 Mercury 4000 12566 Venus 8000 25133 Earth 8400 26389 Mars 2500 7854 Jupiter 135000 424115 Saturn 100000 314159 Uranus 75000 235619 Neptune 70000 219911 Pluto 2750 8639

I wish this thing would display my text just like it is, it almost looks like a table. My teacher is really anal on detail.Basically I have to call the file into the scanner/reader, extract the numerical data, calculate the circumference then save it to another file. Then output the newly saved file to the user. I made this post previously but I am concerned that the user who had gave their answer can't see that I am commenting on it.

April 16, 2011 at 1:03 PM

import java.io.*;
import java.util.*;
import java.math.*;

public class Main{
public static void main(String[] args) throws IOException {
Scanner input = new Scanner(System.in);
System.out.print("\nPlease enter the name of the input file - ");
String Input_File = input.nextLine();
System.out.print("\nPlease specify the name of the output file - ");
String Output_File = input.nextLine();
BufferedWriter bw=new BufferedWriter(new FileWriter(new File(Output_File),true));
String strLine;
ArrayList list=new ArrayList();
}

Iterator itr;
for (itr=list.iterator(); itr.hasNext(); ){
String str=itr.next().toString();
String [] splitSt =str.split(",");
String planet="",diameter="";
for (int i = 0 ; i < splitSt.length ; i++) {
planet=splitSt[0];
diameter=splitSt[1];
}
double r=Double.parseDouble(diameter)/2;
double circumference=2*Math.PI*r;
long cir=Math.round(circumference);
bw.write(planet+"\t "+diameter+"\t "+Long.toString(cir));
bw.newLine();
}
bw.close();
}
}

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