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  1. #include <iostream>
  2. #include <limits>
  3.  
  4. int main() {
  5.   double NaN = std::numeric_limits<double>::quiet_NaN();
  6.  
  7.   bool a = (NaN != 0.0);
  8.  
  9.   bool b = (NaN == 0.0);
  10.   bool c = (NaN == NaN);
  11.   bool d = (NaN != NaN);
  12.   bool e = (NaN < 0.0);
  13.  
  14.   std::cout << std::boolalpha;
  15.   std::cout << "true" << std::endl;
  16.   std::cout << "a = " << a << std::endl;
  17.  
  18.   std::cout << "false" << std::endl;
  19.   std::cout << "b = " << b << std::endl;
  20.   std::cout << "c = " << c << std::endl;
  21.   std::cout << "d = " << d << std::endl;
  22.   std::cout << "e = " << e << std::endl;
  23.   return 0;
  24. }
  25. /* end */
  26.  
  27.  
Success #stdin #stdout 0s 4228KB
comments (?)
stdin
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Standard input is empty
stdout
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true
a = true
false
b = false
c = false
d = true
e = false
https://ideone.com/dzmyeq
language:
C++ (gcc 8.3)
created:
4 years ago
visibility:
public

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