import java.io.*;

class Numbers5
{

// A demonstration that array assignment is aliasing

   static final int SENTINEL = -999;
   static final int MAXNUMS = 100;

   public static void main (String[] args) throws IOException
   {
    int [] a;
    int [] b;
    int count,n;
    int pos1, pos2;

    BufferedReader in = Text.open(System.in);
    a = new int[MAXNUMS];
    for(count=0; ;count++)
       {
        System.out.print("Enter number "+(count+1)+" (or ");
        System.out.print(SENTINEL+" to finish): ");
        n=Text.readInt(in);
        if(n==SENTINEL)
           break;
        a[count]=n;
       }

    System.out.println("The numbers entered into array a are:");
    NumberOps.printall(a,count);

    System.out.println("Do array assignment b=a");
    b=a;
    System.out.println("The numbers held in b are:");
    NumberOps.printall(b,count);

    System.out.println("Enter two positions to swap in array a:");
    System.out.print("Position 1: ");
    pos1=Text.readInt(in);
    System.out.print("Position 2: ");
    pos2=Text.readInt(in);
    Sorter.swap(a,pos1-1,pos2-1);
    System.out.println("After the swap, the numbers in a are:");
    NumberOps.printall(a,count);
    System.out.println("And the numbers in b are:");
    NumberOps.printall(b,count);
   }
}