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  1. #include <iostream>
  2. #include <cstring>
  3. using namespace std;
  4.  
  5. #define SIZE (1)
  6. struct arry
  7. {
  8. 	int *n = NULL;
  9. 	int size;
  10. 	arry()	{ n = new int[SIZE]; size = SIZE; }
  11. 	~arry() { delete [] n; }
  12. 	void incSize() {
  13. 		int *temp = new int[size + 1];
  14. 		memcpy(temp, n, sizeof(int) * size);
  15. 		delete [] n;
  16. 		n = temp;
  17. 		size++;
  18. 	}
  19. };
  20.  
  21. int main() {
  22.  
  23. 	arry dyn;
  24.  
  25. 	dyn.n[0] = 100;
  26.  
  27. 	cout << sizeof dyn.n << endl;
  28. 	cout << dyn.size << endl;
  29.  
  30. 	dyn.incSize();
  31.  
  32. 	cout << sizeof dyn.n << endl;
  33. 	cout << dyn.size << endl;
  34.  
  35. 	dyn.n[1] = 200;
  36.  
  37. 	cout << dyn.n[0] << endl;
  38. 	cout << dyn.n[1] << endl;
  39.  
  40. 	return 0;
  41. }
Success #stdin #stdout 0s 3428KB
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stdin
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Standard input is empty
stdout
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4
1
4
2
100
200
https://ideone.com/I1RCod
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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