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  1. #include <iostream>
  2. #include <cstdint>
  3. #include <cctype>
  4. using namespace std;
  5. template  <class T> T machineZero(void) {
  6. 	T e0 = (T) 0.0F;
  7.  
  8. 	for (T e1 = (T) 1.0F; e1 > (T) 0.0F; e1 /= (T) 2.0F) {
  9. 	   e0 = e1;
  10.    }
  11.    return e0;
  12. }
  13.  
  14. template <class T> T machineEpsilon(void) {
  15. 	T ep0 = (T) 0.0F;
  16. 	T ep = (T) 1.0F;
  17. 	for (T f = (T) 1.0F + ep; f > (T) 1.0F; f = (T) 1.0F + ep) {
  18. 		ep0 = ep;
  19. 		ep /= (T) 2.0F;
  20. 	}
  21. 	return ep;
  22. }
  23.  
  24. int main()
  25. {
  26. 	cout << "Positive limit for type  double : " << machineZero <double>() << endl;
  27. 	cout << "Positive limit for type float : " << machineZero <float> ( ) << endl;
  28. 	cout << "Positive limit for type long double : " << machineZero <long double>() << endl; // можно видеть, что MVS не делает разницы между double и LF даже для x64 набора комнад
  29. 	cout << "Machine epsilon for double : " << machineEpsilon <double>() << endl;
  30. 	cout << "Machine epsilon for float : " << machineEpsilon <float>() << endl;
  31. 	system("PAUSE");
  32. 	return 0;
  33. }
  34.  
Success #stdin #stdout #stderr 0s 16048KB
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stdin
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Standard input is empty
stdout
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Positive limit for type  double : 4.94066e-324
Positive limit for type float : 1.4013e-45
Positive limit for type long double : 3.6452e-4951
Machine epsilon for double : 1.11022e-16
Machine epsilon for float : 5.96046e-08
stderr
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sh: 1: PAUSE: not found
https://ideone.com/G2r66G
language:
C++ (gcc 8.3)
created:
8 years ago
visibility:
public

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