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  1. #define _CRT_SECURE_NO_WARNINGS
  2. #include <cfloat> // _controlfp
  3. #include <cmath>  // sqrt
  4. #include <string>
  5. #include <algorithm>
  6. #include <iostream>
  7. using namespace std;
  8.  
  9. void print_bits(const double& value){
  10.     auto raw=*(unsigned long long*)&value;
  11. 	auto len=sizeof(raw)<<3;
  12. 	auto str=string(len,(char)0);
  13. 	for_each(begin(str),end(str),[&raw](char&chr){
  14. 		chr=(raw&1)?'1':'0';
  15. 		raw>>=1;
  16. 	});
  17. 	reverse(begin(str),end(str));
  18. 	cout<<"0b"<<str<<endl;
  19. }
  20.  
  21. void print_bits(const float& value){
  22. 	auto raw=*(unsigned int*)&value;
  23. 	auto len=sizeof(raw)<<3;
  24. 	auto str=string(len,(char)0);
  25. 	for_each(begin(str),end(str),[&raw](char&chr){
  26. 		chr=(raw&1)?'1':'0';
  27. 		raw>>=1;
  28. 	});
  29. 	reverse(begin(str),end(str));
  30. 	cout<<"0b"<<str<<endl;
  31. }
  32.  
  33. #define _PC_64 0x00000000
  34. #define _PC_53 0x00010000
  35. #define _PC_24 0x00020000
  36. #define _MCW_PC 0x00030000
  37.  
  38. int main(){
  39. 	_controlfp(_PC_24,_MCW_PC);
  40. 	print_bits(sqrt((float)2));
  41. 	print_bits(sqrt((double)2));
  42. 	_controlfp(_PC_53,_MCW_PC);
  43. 	print_bits(sqrt((float)2));
  44. 	print_bits(sqrt((double)2));
  45. 	_controlfp(_PC_64,_MCW_PC);
  46. 	print_bits(sqrt((float)2));
  47. 	print_bits(sqrt((double)2));
  48. }
  49. // VCにて(x86)
  50. //0b00111111101101010000010011110011
  51. //0b0011111111110110101000001001111001100000000000000000000000000000
  52. //0b00111111101101010000010011110011
  53. //0b0011111111110110101000001001111001100110011111110011101111001101
  54. //0b00111111101101010000010011110011
  55. //0b0011111111110110101000001001111001100110011111110011101111001101
  56.  
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https://ideone.com/AMKBrp
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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