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  1. #include <iostream>
  2. #include <cmath>
  3. using namespace std;
  4.  
  5. bool is_integer(double d)
  6. {
  7.     const double EPSILON = 0.000000000001;
  8.     if (std::fabs(std::round(d) - d) < EPSILON)
  9.     {
  10.     	return true;
  11.     }
  12.     return false;
  13. }
  14.  
  15. void test(double numer, double denom)
  16. {
  17. 	double remainder = std::fmod(numer, denom);
  18. 	bool isInt = is_integer(remainder);
  19. 	cout.precision(20);
  20. 	cout << fixed << numer << " / " << denom << " = " << (numer / denom) << ", ";
  21. 	cout << "Is Integer?  " << (isInt ? "Yes" : "No") << endl;
  22. }
  23.  
  24. int main() 
  25. {
  26. 	double numer = std::nexttoward(2, 0);
  27. 	double denom = 2.0;
  28. 	test(numer, denom);
  29.  
  30. 	denom = 1.0;
  31. 	test(numer, denom);
  32.  
  33. 	denom = 3.0;
  34. 	test(numer, denom);
  35. 	return 0;
  36. }
Success #stdin #stdout 0s 3340KB
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Standard input is empty
stdout
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1.99999999999999977796 / 2.00000000000000000000 = 0.99999999999999988898, Is Integer?  Yes
1.99999999999999977796 / 1.00000000000000000000 = 1.99999999999999977796, Is Integer?  Yes
1.99999999999999977796 / 3.00000000000000000000 = 0.66666666666666662966, Is Integer?  Yes
https://ideone.com/UqGsVI
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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