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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. class IntArr
  5. {
  6. 	private:
  7. 		int* ptrArr;		
  8. 		int len;
  9.  
  10. 	public:		
  11. 		IntArr(int len);
  12. 		~IntArr();
  13.  
  14. 		int length() const { return len;}		
  15. 		void compress();
  16. };
  17.  
  18. IntArr::IntArr(int len)
  19. {
  20. 	this->len = len;
  21. 	ptrArr = new int[len];
  22. 	for (int i = 0; i < len; i++)
  23. 	{
  24. 		ptrArr[i] = 0;
  25. 	}
  26. }
  27.  
  28. IntArr::~IntArr()
  29. {
  30. 	delete [] ptrArr;
  31. }
  32.  
  33. void IntArr::compress()
  34. {	
  35. 	int count=0;
  36. 	int index=0;
  37.  
  38. 	for (int i = 0; i < len; i++)
  39. 	{
  40. 		if (ptrArr[i] != 0)
  41. 			count++;
  42. 	}
  43.  
  44. 	int* ptrArr1 = new int[count];
  45.  
  46. 	for (int i = 0; i < len; i++)
  47. 	{		
  48. 		if (ptrArr[i] != 0)			
  49. 		    ptrArr1[index] = ptrArr[i];		    
  50. 			index += 1;
  51. 	}
  52.  
  53. 	delete[] ptrArr;
  54. 	ptrArr = ptrArr1;
  55. 	len = count;
  56. }
  57.  
  58. int main()
  59. {
  60.     IntArr arr(100);
  61.  
  62.     srand((unsigned int)time(NULL));
  63.  
  64.     for (int i = 0; i < arr.length(); i++)
  65.     {
  66.         arr[i] = rand();
  67.     }
  68. }
  69.  
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.cpp: In function ‘int main()’:
prog.cpp:66:12: error: no match for ‘operator[]’ (operand types are ‘IntArr’ and ‘int’)
         arr[i] = rand();
            ^
stdout
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Standard output is empty
https://ideone.com/ZmK7iQ
language:
C++14 (gcc 8.3)
created:
2 years ago
visibility:
public

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