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  1. 	#include <iostream>
  2.  
  3. 	int* getInt1(int input)
  4. 	{
  5. 		int i = input;
  6. 		std::cout << "created 'i' at " << (void*)&i << std::endl;
  7. 		int* ptr1 = &i;
  8. 		return ptr1;
  9. 	}
  10.  
  11. 	int* getInt2(int input)
  12. 	{
  13. 		int* ptr3 = new int(input);
  14. 		return ptr3;
  15. 	}
  16.  
  17. 	int main()
  18. 	{
  19. 		int i = 0;
  20. 		std::cout << "i is on the stack, it's address is " << (void*)&i << std::endl;
  21. 		int* ip = new int(1);
  22. 		std::cout << "ip is on the heap, it's address is " << (void*)ip << std::endl;
  23.  
  24. 		int* p1 = NULL;
  25. 		int* p2 = NULL;
  26. 		int* p3 = NULL;
  27. 		// force the pointers to be assigned locations on the stack by printing them.
  28. 		std::cout << "created p1(" << &p1 << "), p2(" << &p2 << ") and p3(" << &p3 << ")" << std::endl;
  29.  
  30. 		p1 = getInt1(10101);
  31. 		std::cout << "p1(" << &p1 << ") = " << (void*)p1 << " -> " << *p1 << std::endl;
  32.  
  33. 		p2 = getInt1(20202);
  34. 		std::cout << "p2(" << &p2 << ") = " << (void*)p2 << " -> " << *p2 << std::endl;
  35.  
  36. 		// but more importantly
  37. 		std::cout << "p1(" << &p1 << ") = " << (void*)p1 << " -> " << *p1 << std::endl;
  38.  
  39. 		p3 = getInt2(30303);
  40. 		std::cout << "p3(" << &p3 << ") = " << (void*)p3 << " -> " << *p3 << std::endl;
  41. 		std::cout << "p2(" << &p2 << ") = " << (void*)p2 << " -> " << *p2 << std::endl;
  42. 		std::cout << "p1(" << &p1 << ") = " << (void*)p1 << " -> " << *p1 << std::endl;
  43. 	}
  44.  
Success #stdin #stdout 0s 3432KB
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stdin
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Standard input is empty
stdout
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i is on the stack, it's address is 0xbfb49a90
ip is on the heap, it's address is 0x9b83008
created p1(0xbfb49a94), p2(0xbfb49a98) and p3(0xbfb49a9c)
created 'i' at 0xbfb49a6c
p1(0xbfb49a94) = 0xbfb49a6c -> 10101
created 'i' at 0xbfb49a6c
p2(0xbfb49a98) = 0xbfb49a6c -> 20202
p1(0xbfb49a94) = 0xbfb49a6c -> -1078682988
p3(0xbfb49a9c) = 0x9b83018 -> 30303
p2(0xbfb49a98) = 0xbfb49a6c -> -1078682988
p1(0xbfb49a94) = 0xbfb49a6c -> -1078682988
https://ideone.com/wAcY3B
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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