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  1. #include <cfloat>
  2. #include <cmath>
  3. #include <iostream>
  4. using namespace std;
  5.  
  6. auto classify(double x) {
  7.     switch (std::fpclassify(x)) {
  8.         case FP_INFINITE: return "Inf";
  9.         case FP_NAN: return "NaN";
  10.         case FP_NORMAL: return "normal";
  11.         case FP_SUBNORMAL: return "subnormal";
  12.         case FP_ZERO: return "zero";
  13.         default: return "unknown";
  14.     }
  15. }
  16.  
  17. int main() {
  18. 	double x = DBL_MIN;
  19. 	cout << "DBL_MIN is " << classify(x) << endl;
  20. 	cout << x << ": " << (x > 0) << endl;
  21. 	cout << x * x << ": " << "DBL_MIN * DBL_MIN is " << classify(x * x) << endl;
  22. 	cout << (x * x > 0) << endl;
  23. 	return 0;
  24. }
Success #stdin #stdout 0s 5280KB
comments (?)
stdin
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Standard input is empty
stdout
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DBL_MIN is normal
2.22507e-308: 1
0: DBL_MIN * DBL_MIN is zero
0
https://ideone.com/8iDwty
language:
C++ (gcc 8.3)
created:
2 days ago
visibility:
public

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