Can you please write the product of the sums in C++?

Question

C++ / C#

xs how, wrote, but does not give the correct value

for (int i = 0; i <= n-1; i++)
      {
        for (int j = 1; j <= n; j++)
        {
          sum += (x - i + j) * (x - i + j) * (x - i + j);
        }
        y *= sum;
                        }

Answer 1

You need to initialize the accumulator variables before the loops: Before the loop over i, you need to assign y = 1. Before the loop over j, you need to assign sum = 0.
Otherwise, you accumulate the sum for all different i in sum. And y is generally unclear what value it has before multiplication.