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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int n;
  6. 	cout << "enter how many even numbers to sum: ";
  7. 	cin >> n;
  8.  
  9. 	int sum = 0;
  10.  
  11. 	for (int i = 1; i <= n; i++) {
  12. 		sum += 2 * i;
  13. 	}
  14.  
  15. 	cout << "the sum of the first " << n << " even numbers is " << sum << endl;
  16.  
  17. 	return 0;
  18. }
Success #stdin #stdout 0.01s 5312KB
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Standard input is empty
stdout
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enter how many even numbers to sum: the sum of the first 22098 even numbers is 488343702
https://ideone.com/Hqspvc
language:
C++ (gcc 8.3)
created:
2 days ago
visibility:
public

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