求1!+2!+3!+4!+5!+…+n!的和 cpp
时间: 2024-01-11 22:03:52 浏览: 24
以下是两种C++求1!+2!+3!+4!+5!+…+n!的和的例子:
1.使用for循环计算阶乘和
```cpp
#include<iostream>
using namespace std;
int main()
{
int n;
unsigned long long m = 1;
unsigned long long z = 0;
cout << "请输入n的值:";
cin >> n;
for (int i = 1; i <= n; i++)
{
m *= i;
z += m;
}
cout << "1!+2!+3!+...+" << n << "!的和为:" << z << endl; return 0;
}
```
2.使用嵌套for循环计算阶乘和
```cpp
#include<stdio.h>
int main()
{
int i, j, n;
int sum = 0;
int team = 1;
printf("请输入n的值:");
scanf("%d", &n);
if (n <= 0)
{
printf("n为正整数,请重新输入\n");
}
for (i = 1; i <= n; i++)
{
for (j = 1; j <= i; j++)
{
team = team * j;
}
sum = team + sum;
team = 1;
}
printf("1!+2!+3!+...+%d!的和为:%d", n, sum);
return 0;
}
```