一个关于c语言编程实验的问题

double factorial(double y)
{
double j = 1,i;
for (i = 1; i <= y; i++)
{
j *= i;
}
return j;
}
double test(double x)
{
double i,result = 0;
for (i = 1; i <= x; i++)
{
result += i / factorial(i) ;
}
return result;
}
int main()
{
double result, x = 7;
result = test(x);
printf("%.3lf\n", result);
return 0;
}