编写程序计算s=1+1/2!+1/3!+1/4!+...1/n!

#includedouble factorial(int m);//返回正整数n的阶乘结果double sum(int n); //返回累加结果int main(void){ int n; scanf("%d",&n);//格式化地从缓冲区里读取用户键入的数字 printf("s=%.16f\n",sum(n)); //截取小数点后16位 return 0;}doub