Write a for loop in C++ to calculate the sum of the following: 1/3+2/5+3/7+......+10/21

so far I have this but it wont even print for some reason!

#include

#include

#include

using namespace std;

int main()

{

double sum = 0;

int i = 3;

while (i < 21)

{

double j = i;

sum += j / (j + 2);

}

cout << sum << endl;

system("pause");

return 0;

}