蘇宛閮Java遞迴函數Recursion=Recursive Function=Recursive Methods

public class Main {        /*蘇宛閮recursion遞迴函數*/
  public static void main(String[] args) {
    int x = 10;                 /*Java程式必須以main起始*/
    for (int i = 0; i < x; i++)  /*for迴圈*/
    {  System.out.println( i + "累加等於" + sum(i) ); 
       System.out.println("累加等於" + f(i) );} }
  public static int sum(int k) {
    if (k > 0) { return k + sum(k - 1);}
    else { return 0;} }     /*函數sum呼叫自己,稱遞迴*/
  public static int f(int k) {
    if (k > 0) { return k * f(k - 1);}
    else { return 1;} }     /* 0!=1, 7!=7*6!,....*/
}