package test; import java.util.Scanner; public class test { public static void main(String[] args) { Scanner scanner=new Scanner(System.in); System.out.println("enter a number :"); int n=scanner.nextInt(); int sum=0; for(int i=1;i<n;i++) if(n%i==0) sum+=i; if(sum==n) System.out.println("是完全数"); else System.out.println("不是完全数"); } }