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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. union Float{
  5. // public:
  6. 	double m_Val;
  7. 	unsigned long long m_Hex;
  8. 	struct{
  9. 		unsigned long long mantissa:52;
  10. 		unsigned long long exponment:11;
  11. 		unsigned long long sign: 1;
  12. 	};
  13. // public:
  14. 	Float(double val=0.0) : m_Val(val){}
  15. 	void SetMantissa(unsigned long long m)	{
  16. 		mantissa = m;
  17. 	}
  18. 	void SetExponment(unsigned long long e){
  19. 		exponment = e;
  20. 	}
  21. 	void SetSign(unsigned long long s){
  22. 		sign = s;
  23. 	}
  24.  
  25. 	double GetVal(){return m_Val;}
  26. 	unsigned long long GetHex(){return m_Hex;}
  27. };
  28.  
  29. int main()
  30. {
  31. 	Float f;
  32. 	f.SetExponment(0x400ULL);
  33. 	f.SetMantissa(0x8000000000000ULL);
  34. 	f.SetSign(0ULL);
  35.  
  36. 	cout << f.GetVal() << endl;
  37. 	cout << f.GetHex() << endl << endl;
  38.  
  39. 	f.m_Val = 0.5;
  40. 	cout << f.GetVal() << endl;
  41. 	cout << f.GetHex() << endl;
  42. 	cin.get();
  43. 	return 0;
  44. }
Success #stdin #stdout 0.01s 2684KB
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3
4613937818241073152

0.5
4602678819172646912
https://ideone.com/YYgz9
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
public

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