1~100 的和
''' sum = 0 def sub_sum(n): if n == 0: return 0 else: sum = sub_sum(n-1) + n return sum result = sub_sum(100) print(result) ''' def sub_sum(n): count = 0 sum = 0 while count < n: count = count + 1 sum = sum + count return sum result = sub_sum(100) print(result)