20194648—王若宇java

//     n     

package compute;//  

public class Computer {//     

    int sum=1;//        

    public int getJC(int n){
        for(int a=1;a<=n;a++){//for    
            sum =sum*a;
        }
        return sum;//  
    }

package Keyi;//  
import compute.*;//   
import java.util.Scanner;//  
public class App { 

    /**
     * @param args
     */
    public static void main(String[] args) {//   
        // TODO Auto-generated method stub
       Computer com=new Computer();//    b
       Scanner reader=new Scanner(System.in);//       
       System.out.print("       ");//      
       int a=reader.nextInt();//    
       System.out.print("         ："+compute.getJC(a));//    
    }

}

       5
         ：120