Please help... How to do a LOOP?

Question

I'm really very new to Java. In fact, I will need to admit that I haven't learned anything significant about it yet. I've got a professor who wants us to do a systems stability determination. And he wants us to come up with a program written in Java to do it. I've got it down to the code below. It works. But the thing is, after working once, the program ends.
All I want is to ask the user if he/she wants to do it all over again.
Do you want to continue? y/n
If it's a "y" then the program asks the user to enter the order of equation again, and the whole shebang... I'm sure it's as simple as heck, but I really am clueless to this. Please, please help. This is going to be due in about an hour! I kid you not...
Here's the working code...
import java.util.Scanner;
public class control
    public static void main(String args[]) {
         Scanner input = new Scanner(System.in);
         int numcoe, min2, temp, temp2 = 0, temp3, temp4, numroots = 0, col, prevS = 0, currentS;
         double linezero = 1,firstzero = 0;
         System.out.print("Enter order of equation: ");
         numcoe = input.nextInt();
         min2 = numcoe - 3;
         double coeff[] = new double[numcoe+1];
            col = numcoe/2 + numcoe%2;
            double sofx[][] = new double[numcoe+1][col+1];
            System.out.print("Enter coefficients separated by space: ");
         for (temp = 0; temp < numcoe; temp++)
                 coeff[temp] = input.nextInt();
         coeff[temp] = 0;
        for (temp = 0; temp < col; temp++)
              sofx[numcoe-1][temp] = coeff[temp2];
              sofx[numcoe-2][temp] = coeff[temp2+1];
              temp2 += 2;
         for (temp2 = min2; temp2 >= 0; temp2--)
              for(temp=0; temp < col-1; temp++)
              if (temp == 0)
                   sofx[temp2][temp] = ((sofx[temp2+1][temp]*sofx[temp2+2][temp+1])-(sofx[temp2+2][temp]*sofx[temp2+1][temp+1]))/sofx[temp2+1][temp];
                   firstzero = sofx[temp2][temp];
              else
                      sofx[temp2][temp] = ((sofx[temp2+1][temp-1]*sofx[temp2+2][temp+1])-(sofx[temp2+2][temp-1]*sofx[temp2+1][temp+1]))/sofx[temp2+1][temp-1];
                     linezero *= sofx[temp2][temp];
                 if (firstzero == 0 && linezero != 0)
                   sofx[temp2][0] = 0.00000001;
              if (firstzero == 0 && linezero == 0)
                   temp3 = temp2;
                   temp4 = numcoe - temp2 - 1;
                   for(temp=0; temp < col-1; temp++)
                        sofx[temp2][temp] = temp3 * coeff[temp4];
                        temp3--;
                        temp4++;      
           for (temp = numcoe - 1 ; temp >= 0; temp--)
              for (temp2 = 0; temp2 < col; temp2++)
                   System.out.printf("%.4f",sofx[temp][temp2]);     
                   System.out.print("\t\t\t\t");
         System.out.println();
         for (temp = numcoe - 1 ; temp >= 0; temp--)
              if(sofx[temp][0]<0)     
                   currentS = 1;
              else
                   currentS = 0;
              if (prevS != currentS)
                   numroots = numroots + 1;
              prevS=currentS;
            if (numroots > 0)
                 System.out.print("\nThe system is Unstable w/ ");
                 System.out.print(numroots);
                    System.out.print(" roots at RHP\n\n");
            else
                 System.out.print("The system is stable\n");
}Should it also matter that I am using Netbeans IDE 6.5.1 ?
Thanks
Edited by: jeffimperial on Mar 20, 2009 7:12 AM
Edited by: jeffimperial on Mar 20, 2009 7:14 AM

Answer 1

I absolutely agree...
I'm doing it for the 1st and last time for you. If you want some one to solve your homework... then this is not the right site. If you try and then stuck with some problem, only then people will be more than happy to help you...
And moreover, if you don't try it by yourself its impossible to learn...no offense And Happy Coding...
package prac;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Properties;
import java.util.Scanner;
public class asd {
     private void getXYZ()
         Scanner input = new Scanner(System.in);
         int numcoe, min2, temp, temp2 = 0, temp3, temp4, numroots = 0, col, prevS = 0, currentS;
         double linezero = 1,firstzero = 0;
         System.out.print("Enter order of equation: ");
         numcoe = input.nextInt();
         min2 = numcoe - 3;
         double coeff[] = new double[numcoe+1];
            col = numcoe/2 + numcoe%2;
            double sofx[][] = new double[numcoe+1][col+1];
            System.out.print("Enter coefficients separated by space: ");
         for (temp = 0; temp < numcoe; temp++)
                 coeff[temp] = input.nextInt();
         coeff[temp] = 0;
        for (temp = 0; temp < col; temp++)
              sofx[numcoe-1][temp] = coeff[temp2];
              sofx[numcoe-2][temp] = coeff[temp2+1];
              temp2 += 2;
         for (temp2 = min2; temp2 >= 0; temp2--)
              for(temp=0; temp < col-1; temp++)
              if (temp == 0)
                   sofx[temp2][temp] = ((sofx[temp2+1][temp]*sofx[temp2+2][temp+1])-(sofx[temp2+2][temp]*sofx[temp2+1][temp+1]))/sofx[temp2+1][temp];
                   firstzero = sofx[temp2][temp];
              else
                      sofx[temp2][temp] = ((sofx[temp2+1][temp-1]*sofx[temp2+2][temp+1])-(sofx[temp2+2][temp-1]*sofx[temp2+1][temp+1]))/sofx[temp2+1][temp-1];
                     linezero *= sofx[temp2][temp];
                 if (firstzero == 0 && linezero != 0)
                   sofx[temp2][0] = 0.00000001;
              if (firstzero == 0 && linezero == 0)
                   temp3 = temp2;
                   temp4 = numcoe - temp2 - 1;
                   for(temp=0; temp < col-1; temp++)
                        sofx[temp2][temp] = temp3 * coeff[temp4];
                        temp3--;
                        temp4++;      
           for (temp = numcoe - 1 ; temp >= 0; temp--)
              for (temp2 = 0; temp2 < col; temp2++)
                   System.out.printf("%.4f",sofx[temp][temp2]);     
                   System.out.print("\t\t\t\t");
         System.out.println();
         for (temp = numcoe - 1 ; temp >= 0; temp--)
              if(sofx[temp][0]<0)     
                   currentS = 1;
              else
                   currentS = 0;
              if (prevS != currentS)
                   numroots = numroots + 1;
              prevS=currentS;
            if (numroots > 0)
                 System.out.print("\nThe system is Unstable w/ ");
                 System.out.print(numroots);
                    System.out.print(" roots at RHP\n\n");
            else
                 System.out.print("The system is stable\n");
     public asd() {
      * @param args
     public static void main(String[] args) {
          asd a = new asd();
          a.getXYZ();
          try {
               BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
               System.out.println("Would you like to Continue: yes/no");
               String yesNo ="";
               yesNo = br.readLine();
               while(!yesNo.equals("") || !yesNo.equalsIgnoreCase("no")){
                    if(yesNo.equalsIgnoreCase("yes")){                         
                         a.getXYZ();
               System.exit(1);
          } catch (IOException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
}