n的阶乘：1!+2!+3!+…+n!
public static void main(String[] args) { //2.输入一个整数n，实现n的阶乘。n*(n-1)*......*1 Scanner sc = new Scanner(System.in); System.out.println("请输入一个整数n："); int n = sc.nextInt(); int result=1; for (int i = n; i >=1 ; i--) { result *=i; if(i==1) System.out.print(i); else System.out.print(i+"*"); } System.out.println(); System.out.println(result); }