求帮我做一道题吧哈我

#include <stdio.h>
int main()
{
int i, n=10;
double nSum = 0.0;
for (i=1; i<n+1; i++)
{
nSum += 1.0 / (i*1.0*(i+1.0));
}
printf("%lf\n", nSum);
return 0;
}