答案:import java.util.Scanner; public class PrimeFactor { public static void main(String[] args) { Scanner in = new Scanner(System.in); System.out.println("请输入一个正整数:"); int n = in.nextInt(); System.out.print(n "="); for(int k=2;k<=n/2;){ if(n%k==0){ System.out.print(k "*"); n=n/k; k=2; }else{ k ; } } System.out.print(n); } }