Structure use in a function C++ - c++

Question

I want to create a function that returns a structure, then run a loop for that function. The idea is basically to calculate the maximum sum, start point and end point of a set of n numbers (1000 in this case) and this for 10 lines in a text file
struct triple
{
float Max;
int sp;
int ep;
};
triple Max_line(string linename, int n)
{
int k, i, stp, enp, j;
triple Result;
float Maxi;
float T[n];
string s;
stringstream ss(linename);
j = 0;
Maxi = 0;
stp = 0;
enp = 0;
while (getline(ss, s, ',')and k < n)
{
T[j] = atof(s.c_str());
j++;
}
for (i = 0; i < n - 1; i++)
{
int k;
float S;
S = T[i];
k = i;
while (k < n - 1)
{
S = S + T[k + 1];
if (S > Maxi)
{
Maxi = S;
stp = i + 1;
enp = k + 2;
}
k++;
}
}
Result = { Maxi, stp, enp }
return Result;
}
int main(int argc, char *argv[]) {
int i, j;
triple fin;
fstream myfile("1000.txt"); //extract data from a file containing 10 lines each has 1000 different numbers
string a, b;
getline(myfile, a); //skip the first line
for (i = 0; i < 10; i++)
{
getline(myfile, b);
fin = Max_line(b, 1000);
cout << fin.Max << ";" << fin.sp << ";" << fin.ep << endl;
}
return 0;
}
When I printed the results inside the Max_line function it gave me the right values, I don't understand why it's not working inside the for loop.
Can anyone help me with that please?