例子：2^64==?

package heng.java.level2;import java.util.Scanner;public class powTest {	public static void main(String[] args) {				Scanner input = new Scanner(System.in);		while(input.hasNext()){			int x = input.nextInt();			int n = input.nextInt();			long value = pow(x,n);			System.out.println(value);		}	}	public static boolean isEven(int m){		boolean flag = false;		if(m % 2 == 0){			flag = true;		}		return flag;	}	public static long pow(long x, int n){		if(n == 0){			return 1;		}		if(n == 1){			return x;		}		if(isEven(n)){//判断是不是偶数			return pow(x*x, n/2);		}else{			return pow(x*x,n/2)*x;		}	}}