Rightmost Digit

Sample Input
2
3
4
Sample Output
7
6
Hint
In the first case, 3 * 3 * 3 = 27, so the rightmost digit is 7.

In the second case, 4 * 4 * 4 * 4 = 256, so the rightmost digit is 6.

題目的意思是：求出n的n次冪的個位上的數；

任何兩個數相乘的最低位一定是它們最低位相乘所得結果的最低位，並且循環不會超過4次；

import java.util.Scanner;
public class PracticeIII {
public static void main(String[] args) {
Scanner sc= new Scanner(System.in);
int t,a,b,c,d;
long n;
t = sc.nextInt();
while((t--)>0){
n = sc.nextLong();
a = (int) (n%10);
b = a * a % 10;
c = b * a % 10;
d = c * a % 10;
switch((int)n % 4){
case 0 : 
System.out.println(d);
break;
case 1 :
System.out.println(a);
break;
case 2 :
System.out.println(b);
break;
case 3 :
System.out.println(c);
break;
}
}
}
}