Calling methods from within other methods

------------------------程序如下:-----------------------------

/*
 * File: Combinations.java
 * -----------------------
 * This program computes the mathematical combinations function
 * C(n, k), which is the number of ways of selecting k objects
 * from a set of n distinct objects.
 */

package chapter5;
import java.util.Scanner;

public class Combinations {

 public void run(){
  
  　　int n;
  　　int k;
 　　 int result;
 　　 System.out.println("please input the n:");
 　　 Scanner input=new Scanner(System.in);
 　　 n=input.nextInt();
  　　System.out.println("please input the k:");
  　　Scanner input1=new Scanner(System.in);
  　　k=input1.nextInt();
  　　result=Combinations(n,k);                                        // 调用函数Combinations(int n,int k)
 　　 System.out.println("C("+n+","+k+")="+result);
  
 }
   // 计算C(n,k)=n!/(k!*(n-k)!)
  private static int Combinations(int n,int k){
      　int result;
  　    result=factorial(n)/(factorial(k)*factorial(n-k));     // 调用函数factorial(int n)
  　    return result;
  }
  // 计算n!
  private static int factorial(int n) {
   　　int result=1;
   　　for(int i=1;i<=n;i++){
        result*=i;
   }
   return result;
   
  }
 
}

-------------------------运行程序-----------------