import java.util.Scanner;

public class Pracetice3 {

    public static void main(String[] args) {

Scanner keyboard = new Scanner(System.in);

int t,a,b,c,d; 

t = keyboard.nextInt();

while (t-- !=0 & t<=20) {

    a =keyboard.nextInt();

    b =keyboard.nextInt();

    c =keyboard.nextInt();

    d= keyboard.nextInt();

   System.out.print(a+" "+b+" "+c+" "+d+" ");

   if(d-a==3*(c-b)){

System.out.print(2*d-c);

   }

   else{

System.out.print(d*d/c);

   }

}

    }

}

可以請問各位這樣執行為什麼是錯的呢? 謝謝大家

第 1 測資點(100%): WA (line:1) 
答案不正確 

您的答案為: 1 2 3 4 51 2 4 ...略
正確答案為: 1 2 3 4 5

println才能分行