import java.util.*;public class lianxi31 {public static void main(String[] args) { Scanner s = new Scanner(System.in); int a[] = new int[20];System.out.println("請輸入多個正整數（輸入-1表示結束）："); int i=0,j; do{  a[i]=s.nextInt();  i++; }while (a[i-1]!=-1); System.out.println("你輸入的數組為："); for( j=0; j<i-1; j++) { System.out.print(a[j]+" ");} System.out.println("/n數組逆序輸出為："); for( j=i-2; j>=0; j=j-1) { System.out.print(a[j]+" ");} } }