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  1. #include <iostream>
  2.  
  3. int steps_up, steps_down;
  4.  
  5. int add_up(int x)
  6. {
  7.     ++steps_up;
  8.     if(x == 10)
  9.       return x;
  10.     return x + add_up(x + 1);
  11. }
  12.  
  13. int add_down(int x)
  14. {
  15.     ++steps_down;
  16.     if(x == 1)
  17.       return x;
  18.     return x + add_down(x - 1);
  19. }
  20.  
  21.  
  22. int main()
  23. {
  24.     using namespace std;
  25.     steps_up = 0;
  26.     steps_down = 0;
  27.     cout << "sum from left to right = " << add_up(1) << endl;
  28.     cout << "sum from left to right took " << steps_up << " steps." <<endl;
  29.     cout << "sum from right to left = " << add_down(10) << endl;
  30.     cout << "sum from right to left took " << steps_down << " steps." << endl;
  31.     return 0;
  32. }
Success #stdin #stdout 0s 2724KB
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stdin
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Standard input is empty
stdout
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sum from left to right = 55
sum from left to right took 10 steps.
sum from right to left = 55
sum from right to left took 10 steps.
https://ideone.com/MFJth
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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