#include
#include <stdio.h>
int sum_fun(int n) //递归函数求各项阶乘
{
if (1 == n)
{
return 1;
}
else
{
return sum_fun(n - 1)*n;
}
}
int main()
{
int i, n, sum = 0;
printf("n = ");
scanf("%d", &n);
for (i = 1; i <= n; i++) //求各项阶乘之和
{
sum += sum_fun(i);
}
printf("sum = %d\n", sum);
return 0;
}