用python实现1!+2!+3!+4!+...+n!
时间: 2023-11-28 19:45:42 浏览: 1119
以下是两种Python实现1!+2!+3!+...+n!的方法:
方法一:使用for循环计算阶乘和
```python
n = int(input("请输入一个正整数:"))
sum = 0
for i in range(1, n+1):
factorial = 1
for j in range(1, i+1):
factorial *= j
sum += factorial
print("1!+2!+3!+...+n!的和为:", sum)
```
方法二:使用递归函数调用阶乘方法求和
```python
def jie(n):
if n == 1:
return 1
else:
return n*jie(n-1)
n = int(input("请输入一个正整数:"))
sum = 0
if n < 1 or n > 40:
print("请重新输入数据")
else:
for i in range(1, n+1):
sum += jie(i)
print("1!+2!+3!+...+n!的和为:", sum)
```
相关问题
python中1!+2!+...+n!
可以使用循环和递归两种方法来实现1!+2!+...+n!的求和。
循环方法的代码如下:
```python
def factorial(n):
result = 1
for i in range(1, n+1):
result *= i
return result
def sum_of_factorials(n):
result = 0
for i in range(1, n+1):
result += factorial(i)
return result
```
递归方法的代码如下:
```python
def factorial(n):
if n == 0:
return 1
else:
return n * factorial(n-1)
def sum_of_factorials(n):
if n == 0:
return 1
else:
return factorial(n) + sum_of_factorials(n-1)
```
用Python编程实现1!+2!+3!+...+n!
以下是Python编程实现1!+2!+3!+...+n!的方法:
```python
def factorial_sum(n):
sum = 0
factorial = 1
for i in range(1, n+1):
factorial *= i
sum += factorial
return sum
n = 5
print(factorial_sum(n)) # 输出:153
```