//Computer类
package com;
public class Computer {
int n;
static int num=1;//定义初值
public int jiecheng(int aa){
for(int i=1;i<=aa;i++){//循环求阶乘
num*=i;
}
return num;
}
}
//App
package cn;
import java.util.Scanner;
import com.Computer;
public class App {
public static void main(String[] args) {
System.out.println("输入一个数");
Computer com=new Computer();//创建com对象
Scanner reader=new Scanner(System.in);
int aa=reader.nextInt();//接受键盘输入
System.out.println("阶乘为:"+com.jiecheng(aa));//调用com中的jiecheng()的返回值
}
}