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  1. #include <assert.h>
  2.  
  3. int Floor(double x) {
  4.   const int int_part = (int)x;
  5.  
  6.   if (int_part >= 0) {
  7.     return int_part;
  8.   } else {
  9.     return int_part - (x != int_part);
  10.   }
  11. }
  12.  
  13. int Ceil(double x) {
  14.   const int int_part =(int)x;    
  15.  
  16.   if (int_part < 0) {
  17.     return int_part;
  18.   } else {
  19.     return int_part + (x != int_part); 
  20.   }
  21. }
  22.  
  23. int main() {
  24.   assert(Ceil(0.0) == 0);
  25.   assert(Floor(0.0) == 0);
  26.  
  27.   assert(Ceil(1.0) == 1);
  28.   assert(Floor(1.0) == 1);
  29.  
  30.   assert(Ceil(-1.0) == -1);
  31.   assert(Floor(-1.0) == -1);
  32.  
  33.   assert(Ceil(1.2) == 2);
  34.   assert(Floor(1.2) == 1);
  35.  
  36.   assert(Ceil(-1.2) == -1);
  37.   assert(Floor(-1.2) == -2);
  38.  
  39.   return 0;
  40. }
Success #stdin #stdout 0s 1784KB
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https://ideone.com/kGFfuD
language:
C99 (gcc 8.3)
created:
11 years ago
visibility:
public

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