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  1. #include <iostream>
  2. #include <limits>
  3. #include <typeinfo>
  4.  
  5. #if 0
  6. #define ACTION(x) (T)(x)
  7. #else
  8. #define ACTION(x) x
  9. #endif
  10.  
  11. template< typename T >
  12. void zeige_epsilon()
  13. {
  14.     using namespace std;
  15.     T eps = 1;
  16.     int radix = std::numeric_limits<T>::radix;
  17.     for( T next_eps = eps; ACTION(T(1) + next_eps) > T(1); next_eps = eps/radix )
  18.         eps = next_eps;
  19.     cout << "Mein epsilon                     : " << eps << endl;
  20.  
  21.     cout << "numeric_limits< " << typeid(T).name() << " >::epsilon: " << numeric_limits< T >::epsilon() << endl;
  22.     cout << "Beide Epsilons sind " << (eps == numeric_limits< T >::epsilon()? "gleich": "verschieden") << "\n" << endl;
  23. }
  24.  
  25. int main()
  26. {
  27.     zeige_epsilon< double >();
  28.     zeige_epsilon< float >();
  29.     zeige_epsilon< long double >();
  30.     return 0;
  31. }
Success #stdin #stdout 0.01s 2684KB
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stdin
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Standard input is empty
stdout
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Mein epsilon                     : 2.22045e-16
numeric_limits< d >::epsilon: 2.22045e-16
Beide Epsilons sind gleich

Mein epsilon                     : 1.19209e-07
numeric_limits< f >::epsilon: 1.19209e-07
Beide Epsilons sind gleich

Mein epsilon                     : 1.0842e-19
numeric_limits< e >::epsilon: 1.0842e-19
Beide Epsilons sind gleich
https://ideone.com/wGNuJ
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
secret

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