Question

编写程序，计算1！2！+…+n! 用C++写

RT

Answer 1

#include <iostream>
using namespace std;
long fun(int n);int main()
{
int m;
cout<<"输入m的值："<<endl;
cin>>m;
long k = 0;
for (int i = 1; i <= m; i++)
{
k += fun(i);
}
cout<<"k=:"<<k<<endl; return 0;
}long fun(int n)
{
long s = 1;
if (0 == n)
{
s = 1;
}
else
{
for (int i = 1; i <= n; i++)
{
s *= i;
}
} return s;
}

Answer 2

#include<iostream>
using namespace std;
void main()
{
int p=1,i,s=0;
int n;
cout<<"请输入n:";
cin>>n;
for(i=1;i<=n;i++)
{
p*=i;
s+=p;
}
cout<<s<<endl;
}