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  1. #include <iostream>
  2. #include <cmath>
  3.  
  4. int main()
  5. {
  6. double a = -std::nan("1");
  7.  
  8. std::cout << a << std::endl;
  9. }
  10.  
  11.  
Success #stdin #stdout 0s 3468KB
stdin
Standard input is empty
stdout
-nan