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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. int calculateS(int n) {
  6.     int sum = 0;
  7.     for (int i = 1; i <= n; i++) {
  8.         sum += (i % 2 == 0) ? -i : i; // Nếu i chẵn thì trừ, i lẻ thì cộng
  9.     }
  10.     return sum;
  11. }
  12.  
  13. int main() {
  14.     int n;
  15.     cout << "Nhap n: ";
  16.     cin >> n;
  17.  
  18.     int result = calculateS(n);
  19.     cout << "Gia tri S(" << n << ") = " << result << endl;
  20.  
  21.     return 0;
  22. }
  23.  
Success #stdin #stdout 0.01s 5288KB
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Nhap n: Gia tri S(2) = -1
https://ideone.com/SP5CiK
language:
C++ (gcc 8.3)
created:
4 days ago
visibility:
public

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