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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int sumToN(int n) {
  5.     if (n == 1)
  6.         return 1;
  7.     return n + sumToN(n - 1); 
  8. }
  9.  
  10. int main() {
  11.     int n;
  12.     cout << "Введіть n: ";
  13.     cin >> n;
  14.  
  15.     if (n <= 0) { 
  16.         cout << "Помилка! n повинно бути додатним цілим числом." << endl;
  17.         return 0; 
  18.     }
  19.  
  20.     cout << "Сума 1.." << n << " = " << sumToN(n) << endl;
  21.  
  22.     return 0;
  23. }
Success #stdin #stdout 0.01s 5288KB
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stdin
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7
stdout
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Введіть n: Сума 1..7 = 28
https://ideone.com/KEF8dD
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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