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  1. #include <iostream>
  2. using namespace std;
  3. unsigned int calculateTriangleNum(unsigned int n);
  4. int main(){
  5.   unsigned int n;
  6.  
  7.  
  8.   cin >> n;
  9.  
  10.   cout  <<  calculateTriangleNum(n) << endl;
  11.  
  12.   return 0;
  13. }
  14. unsigned int calculateTriangleNum(unsigned int n) {
  15.  
  16.     if(n==0)
  17.     {
  18.         return 0;
  19.     }
  20.     else if(n==1)
  21.     {
  22.         return 1;
  23.     }
  24.     else
  25.     {
  26.         return (n % 10 + calculateTriangleNum(n / 10));
  27.     }
  28. }
Success #stdin #stdout 0s 15232KB
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stdout 
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https://ideone.com/pOPzu9
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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