Answer:
#include <iostream>
using namespace std;
int main()
{
int input = 0;
int count = 0;
int sum = 0;
int sumNegative = 0;
while (true) {
 cout << "Enter a number: ";
 cin >> input;
 if (input == 0) break;
 count++;
 sum += input;
 if (input < 0) {
 sumNegative += input;
 }
}
cout << "Count of the numbers: " << count << endl;
cout << "Sum of all the numbers: " << sum << endl;
cout << "Sum of the negative numbers: " << sumNegative << endl;
}
Explanation:
Your requirements regarding the sum and the negative numbers was a bit vague so I just did something you can probably adjust easily to your liking.
