循环实现:
#include <bits/stdc++.h>
using namespace std;
int factsum(int n)
{
int i,j;
int z = 1;
int sum = 0;
if(n == 0 )
return 0;
for(i = 1;i <= n;i++) //外层循环求阶乘的和
{
for(j = 1;j <= i;j++) //内层函数求具体某个数的阶乘
{
z *= j;
}
sum += z;
}
return z;
}
int main(void)
{
int a;
cin>>a;
cout<<factsum(a);
cout<<endl;
return 0;
}
递归实现:
#include <bits/stdc++.h>
using namespace std;
int fact(int n) //求某个数阶乘的函数
{
int i;
if(n == 1 || n == 0)
i = 1;
else
i = n*fact(n-1);
return i;
}
int factsum(int n) //求阶乘的和的函数
{
int j;
if(n == 0)
j = 0;
else if(n == 1)
j = 1;
else
j = factsum(n-1) + fact(n);\
return j;
}
int main(void)
{
int a;
cin>>a;
cout<<factsum(a);
cout<<endl;
return 0;
}