利用计算正整阶乘的函数,编写程序,求阶乘的和1!+2!+...+n!的和
时间: 2023-11-21 18:05:54 浏览: 50
以下是利用计算正整阶乘的函数,编写程序,求阶乘的和1!+2!+...+n!的和的Python代码:
```python
def factorial(n):
if n == 0:
return 1
else:
return n * factorial(n-1)
n = int(input("请输入一个正整数n:"))
sum = 0
for i in range(1, n+1):
sum += factorial(i)
print("1!+2!+...+n!的和为:", sum)
```
运行结果如下:
```
请输入一个正整数n:5
1!+2!+...+n!的和为: 153
```
相关问题
先编写阶乘函数,然后计算 1! + 2! + 3! + ... + n!
以下是Python中计算1!+2!+3!+...+n!的代码:
```python
# 定义阶乘函数
def factorial(n):
if n == 0:
return 1
else:
return n * factorial(n-1)
# 计算1!+2!+3!+...+n!
def sum_factorial(n):
sum = 0
for i in range(1, n+1):
sum += factorial(i)
return sum
# 测试
n = 10
print("1! + 2! + 3! + ... + {}! = {}".format(n, sum_factorial(n)))
```
输出结果为:
```
1! + 2! + 3! + ... + 10! = 4037913
```
C语言先编写阶乘函数,然后计算 1! + 2! + 3! + ... + n!
以下是C语言的阶乘函数和计算1!+2!+3!+...+n!的代码实现:
```c
#include <stdio.h>
// 阶乘函数
int factorial(int n) {
int result = 1;
for (int i = 1; i <= n; i++) {
result *= i;
}
return result;
}
int main() {
int n, sum = 0;
printf("请输入一个正整数n:");
scanf("%d", &n);
for (int i = 1; i <= n; i++) {
sum += factorial(i);
}
printf("1! + 2! + 3! + ... + %d! = %d\n", n, sum);
return 0;
}
```