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  1. #include <iostream>
  2. #include <cmath>
  3. #include <cfenv>
  4. #include <cerrno>
  5. #include <cstring>
  6.  
  7. using namespace std;
  8.  
  9. void throw_fe()
  10. {
  11.     if (errno) throw runtime_error(strerror(errno));
  12.     if(fetestexcept(FE_DIVBYZERO))     throw runtime_error("FE_DIVBYZERO");
  13.     if(fetestexcept(FE_INEXACT))       throw runtime_error("FE_INEXACT");
  14.     if(fetestexcept(FE_INVALID))       throw runtime_error("FE_INVALID");
  15.     if(fetestexcept(FE_OVERFLOW))      throw runtime_error("FE_OVERFLOW");
  16.     if(fetestexcept(FE_UNDERFLOW))     throw runtime_error("FE_UNDERFLOW");
  17. }
  18.  
  19.  
  20. double Pow(double x, double y)
  21. {
  22.     errno = 0;
  23.     feclearexcept(FE_ALL_EXCEPT);
  24.     double z = pow(x,y);
  25.     throw_fe();
  26.     return z;
  27. }
  28.  
  29. double Sqrt(double x)
  30. {
  31.     errno = 0;
  32.     feclearexcept(FE_ALL_EXCEPT);
  33.     double z = sqrt(x);
  34.     throw_fe();
  35.     return z;
  36. }
  37.  
  38. double Log(double x)
  39. {
  40.     errno = 0;
  41.     feclearexcept(FE_ALL_EXCEPT);
  42.     double z = log(x);
  43.     throw_fe();
  44.     return z;
  45. }
  46.  
  47.  
  48. int main()
  49. {
  50.     try {
  51.         double q = Sqrt(-2) + Pow(1e20,1e20);
  52.         printf("log(0) = %f\n", q);
  53.     } catch(exception&e)
  54.     {
  55.         cout << "Catch: " << e.what()  << endl;
  56.     }
  57. }
  58.  
Success #stdin #stdout 0s 4496KB
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Standard input is empty
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Catch: Numerical argument out of domain
https://ideone.com/6xATJw
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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