public class Main { /*李柔蓁recursion遞迴函數*/ public static void main(String[] args) { int x = 11; /*Java程式必須以main起始*/ for (int i = 0; i 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!,....*/ }