6. แยกย่อย

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รหัสที่ 6-18  เมท็อดหาผลบวก 1+2+...+n (แบบเรียกซ้ำ Sn = Sn-1+n เมื่อ n>0, S0 = 0) 
public static int sum(int n) {
  if (n == 0) return 0;
  int s = sum(n-1) + n;
  return s;
}
©2009 S.Prasitjutrakul