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  1. #include <iostream>
  2.  
  3. void regular_function(int i)
  4. {
  5.     i=5; // the outside `i' doesn't change, because `i' is a local copy
  6. }
  7.  
  8. void smart_function(int &i)
  9. {
  10.     i=5; // the outside `i' changes to 5, because `i' is a reference
  11. }
  12.  
  13. int main()
  14. {
  15.     int var = 10;
  16.  
  17.     smart_function(var);
  18.     std::cout << var << std::endl;
  19. }
  20.  
Success #stdin #stdout 0.02s 2724KB
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Standard input is empty
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5
https://ideone.com/A08H7
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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