how to add numbers in for loop c++
#include <iostream>
int main() {
int n = 0;
int sum = 0;
std::cout << "Please enter and integer: ";
std::cin >> n;
//this will ensure that the integer is posetive.
while (n < 0 ) {
std::cout <<"Please enter positive integer only.\n";
std::cout << "Please enter and integer: ";
std::cin >> n;
}
for (int i = 0; i < n ; i++) {
std::cout << i << "\n";
sum +=i
}
std::cout << "Sum of odd numbers is " << sum <<".\n";
}