编写程序,计算s=1!+2!+3!+…+n!
时间: 2023-11-15 20:05:37 浏览: 102
可以使用循环和递归两种方式来计算s=1!+2!+3!+…+n!,下面分别给出两种实现方式的代码:
1. 循环实现:
```python
def factorial(n):
result = 1
for i in range(1, n+1):
result *= i
return result
def sum_of_factorials(n):
s = 0
for i in range(1, n+1):
s += factorial(i)
return s
```
2. 递归实现:
```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)
```
相关问题
编写程序,计算s=1!+2!+3!…+n!
可以使用循环和递归两种方式来计算s=1!+2!+3!…+n!,下面分别给出两种实现方式的代码:
1. 循环实现方式:
```python
def factorial(n):
result = 1
for i in range(1, n+1):
result *= i
return result
def sum_factorial(n):
s = 0
for i in range(1, n+1):
s += factorial(i)
return s
```
2. 递归实现方式:
```python
def factorial(n):
if n == 1:
return 1
else:
return n * factorial(n-1)
def sum_factorial(n):
s = 0
for i in range(1, n+1):
s += factorial(i)
return s
```
编写程序,计算s=1!+2!+…+n!
可以使用循环结构和递归两种方式来计算s=1!+2!+…+n!。
1. 循环结构方式:
```
#include <iostream>
using namespace std;
int main() {
int n;
cout << "请输入n的值:";
cin >> n;
int s = 0, fac = 1;
for (int i = 1; i <= n; i++) {
fac *= i;
s += fac;
}
cout << "s的值为:" << s << endl;
return 0;
}
```
2. 递归方式:
```
#include <iostream>
using namespace std;
int factorial(int n) {
if (n == 1) {
return 1;
} else {
return n * factorial(n - 1);
}
}
int main() {
int n;
cout << "请输入n的值:";
cin >> n;
int s = 0;
for (int i = 1; i <= n; i++) {
s += factorial(i);
}
cout << "s的值为:" << s << endl;
return 0;
}
```
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