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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. class BitArr
  5. {
  6. 	public:
  7. 	unsigned char * data;
  8. 	BitArr(int);
  9. 	bool getValue(int);
  10. 	void setValue(int, bool);
  11. 	~BitArr();
  12. };
  13.  
  14. BitArr::BitArr(int s)
  15. {
  16. 	int size = s/8;
  17. 	if(s%8!=0)
  18. 		size++;
  19.  
  20. 	this->data = (unsigned char*)calloc(size, sizeof(unsigned char));
  21. }
  22.  
  23. BitArr::~BitArr()
  24. {
  25. 	free(this->data);
  26. }
  27.  
  28. bool BitArr::getValue(int pos)
  29. {
  30. 	return (*(this->data+pos/8) & (1<<(8-pos%8)));
  31. }
  32.  
  33. void BitArr::setValue(int pos, bool val)
  34. {
  35. 	if(val == true)
  36. 		*(this->data+pos/8) |= (1<<(8-pos%8));
  37. 	else
  38. 		*(this->data+pos/8) &= ~(1<<(8-pos%8));
  39. 	return;
  40. }
  41.  
  42. int main() {
  43. 	BitArr a(20);
  44. 	a.setValue(3, true);
  45. 	a.setValue(7, true);
  46. 	a.setValue(18, true);
  47. 	for(int i = 0 ; i<20; i++)
  48. 		cout << a.getValue(i);
  49. 	return 0;
  50. }
Success #stdin #stdout 0s 3428KB
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stdin
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Standard input is empty
stdout
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00010001000000000010
https://ideone.com/ntfUSh
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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