首页1！+2！+...n！

1！+2！+...n！

时间: 2024-01-17 10:05:13 浏览: 96

以下是两种方法来计算1！+2！+...+n！的和：方法一：使用循环和阶乘函数 ```python def factorial(n): result = 1 for i in range(1, n+1): result *= i return result def sum_of_factorials(n): sum = 0 for i in range(1, n+1): sum += factorial(i) return sum n = 5 result = sum_of_factorials(n) print("1! + 2! + ... + {}! = {}".format(n, result)) # 输出：1! + 2! + ... + 5! = 153 ``` 方法二：使用递归函数 ```python def factorial(n): if n == 0: return 1 else: return n * factorial(n-1) def sum_of_factorials(n): if n == 0: return 0 else: return factorial(n) + sum_of_factorials(n-1) n = 5 result = sum_of_factorials(n) print("1! + 2! + ... + {}! = {}".format(n, result)) # 输出：1! + 2! + ... + 5! = 153 ```

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