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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	double sum = 0 , a_first, a_prev, a_cur;
  6. 	cin >> a_first;
  7.     a_cur = a_first;
  8.     a_prev = a_first;
  9.  
  10. 	while (a_cur >= 0) {
  11. 		cin >> a_cur;
  12. 		if (a_cur < 0) {
  13. 			sum += a_prev*a_first;
  14. 			break;
  15. 		}
  16. 		sum += a_prev*a_cur;
  17. 		a_prev = a_cur;
  18. 	}
  19.  
  20. 	cout << "Sum = " << sum << endl;
  21.  
  22. 	return 0;
  23. }
Success #stdin #stdout 0s 3432KB
comments (?)
stdin 
-223
6 0 45 3 -1
2 3 4 -5
stdout 
Sum = 0
https://ideone.com/XKNVaG
A165ж
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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