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  1. #include <cassert>
  2. #include <functional>
  3.  
  4. int floorCeilImpl(const std::function<bool (int, int)> &comparator,
  5.                   const std::function<int (int, int)> &operation,
  6.                   double x) {
  7.  
  8.   const int int_part = static_cast<int>(x);
  9.  
  10.   if (comparator(int_part, 0)) {
  11.     return int_part;
  12.   } else {
  13.     return operation(int_part, (x != int_part));
  14.   }
  15.  
  16. }
  17.  
  18. int floor(double x) {
  19.   return floorCeilImpl(std::greater_equal<int>(), std::minus<int>(), x);  
  20. }
  21.  
  22. int ceil(double x) {
  23.   return floorCeilImpl(std::less<int>(), std::plus<int>(), x);  
  24. }
  25.  
  26. int main() {
  27.   assert(ceil(0.0) == 0);
  28.   assert(floor(0.0) == 0);
  29.  
  30.   assert(ceil(1.0) == 1);
  31.   assert(floor(1.0) == 1);
  32.  
  33.   assert(ceil(-1.0) == -1);
  34.   assert(floor(-1.0) == -1);
  35.  
  36.   assert(ceil(1.2) == 2);
  37.   assert(floor(1.2) == 1);
  38.  
  39.   assert(ceil(-1.2) == -1);
  40.   assert(floor(-1.2) == -2);
  41.  
  42.   return 0;
  43. }
Success #stdin #stdout 0s 2984KB
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https://ideone.com/1X13Kp
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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