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  6.  
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  8.  
  9. #include <iostream>
  10.  
  11. using namespace std;
  12. double* foo(double* ptr_a, double*& ptr_b) {
  13. 	double c = 7.3;
  14. 	double* ptr_c = &c;
  15.  
  16. 	std::cout << "4. " <<  *ptr_a << " " << *ptr_b << std::endl;
  17. 	std::cout << "5. "  <<  ptr_a << " " << ptr_b << std::endl;
  18. 	std::cout << "6. "  << &ptr_a << " " << &ptr_b << std::endl;
  19.  
  20. 	*ptr_a = c;
  21.  
  22. 	ptr_a = ptr_c;
  23.     ptr_b = ptr_c;
  24.  
  25. 	return ptr_c;
  26. }
  27.  
  28. int main() { 
  29. 	double a = 4.1;
  30. 	double b = 5.6;
  31.  
  32. 	double* ptr_a = &a;
  33. 	double* ptr_b = &b;
  34.  
  35. 	std::cout << "1. " <<  *ptr_a << " " << *ptr_b << std::endl;
  36. 	std::cout << "2. "  << ptr_a << " " << ptr_b << std::endl;
  37. 	std::cout << "3. "  << &ptr_a << " " << &ptr_b << std::endl;
  38.  
  39. 	double* ptr_c = foo(ptr_a, ptr_b);
  40.  
  41. 	std::cout  << "7. "  <<  ptr_c << std::endl;
  42.  
  43. 	std::cout  << "8. "  <<  *ptr_a << " " << *ptr_b << std::endl;
  44. 	std::cout  << "9. "  <<  ptr_a << " " << ptr_b << std::endl;
  45. 	std::cout  << "10. "  <<  &ptr_a << " " << &ptr_b << std::endl;
  46. }
  47.  
  48.  
Success #stdin #stdout 0.01s 5396KB
comments (?)
stdin 
45
stdout 
1. 4.1 5.6
2. 0x7fff71c5f948 0x7fff71c5f950
3. 0x7fff71c5f958 0x7fff71c5f960
4. 4.1 5.6
5. 0x7fff71c5f948 0x7fff71c5f950
6. 0x7fff71c5f908 0x7fff71c5f960
7. 0
8. 7.3 6.95324e-310
9. 0x7fff71c5f948 0x7fff71c5f910
10. 0x7fff71c5f958 0x7fff71c5f960
https://ideone.com/3hIQiC
language:
C++14 (gcc 8.3)
created:
2 years ago
visibility:
public

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