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/*filename:P6Q12
 *Name:Wang Chaoran
Desciprtion:
12 (Reversing an array)
The reverse method in §6.5 reverses an array by copying it to a new array.
Rewrite the method without creating new arrays.
*/
class P6Q12{
  public static void main(String[] args){
    double[] test1= {1,2,3,4,5,6,7,8,9};
    double[] test2= {1,2,3,4,5,6,7,8,9,10,11,12};
    System.out.println("Previous:");
    print(test1);
    System.out.println("After:");
    reverse(test1);
     print(test1);
    
    System.out.println("Previous:");
    print(test2);
    System.out.println("After:");
    reverse(test2);
     print(test2);
  }
  static double[] reverse(double[] array){
    double temp =0;
    for(int i=0;i<array.length/2+1;i++){
      temp=array[i];
      array[i]=array[array.length-1-i];
      array[array.length-1-i]=temp;
    }
    return array;
  }
  static void print(double[] array){
    for(int i=0;i<array.length;i++)
      System.out.print(array[i]+" ");
    System.out.println();
   
  }
}