题目：编写函数（详情见图片）谢谢！

Question

 

Answer 1

阶乘的倒数之和啊

double fun(int n)
{
    double sum = 0;
    int i=0,j=0,jc=1;
    for(i=1;i<=n;i++)
    {
        jc=1;
        for(j=1;j<=i;j++)
            jc*=j;
        sum += 1.0/jc;
    }
    return sum;
}