RadioNurshat

NumberOfEntireDigits

Sep 27th, 2020
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  1.  
  2. #include <iostream>
  3. using namespace std;
  4. int sumOfDigits(int n) {
  5.     int result = 0;
  6.     while (n > 0) {
  7.         result += 1;
  8.         n = n / 10;
  9.     }
  10.     return result;
  11. }
  12. int main()
  13. {
  14.     int n = 0;
  15.     int result = 0;
  16.     cin >> n;
  17.     for (int i = 1; i <= n; i++) {
  18.         result += sumOfDigits(i);
  19.     }
  20.     cout << result;
  21. }
  22.  
  23.  
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