meaning after variable type

Question

Possible Duplicate    What are the differences between pointer variable and reference variable in C      What  39 s the meaning of   and  amp  when applied to variable names        Trying to understand meaning of   amp   in this situation  void af int amp  g        g        cout lt  lt g      If you call this function and pass variable name - it will act the same like normal void int g   I know  when you write  amp g that means you are passing address of variable g  But what does it means in this sample

User · Answer

It means you re passing the variable by reference   In fact  in a declaration of a type  it means reference  just like   int x   42  int amp  y   x    declares a reference to x  called y

User · Answer

The  amp  means that the function accepts the address  or reference  to a variable  instead of the value of the variable   For example  note the difference between this   void af int amp  g        g        cout lt  lt g     int main         int g   123      cout  lt  lt  g      af g       cout  lt  lt  g      return 0      And this  without the  amp     void af int g        g        cout lt  lt g     int main         int g   123      cout  lt  lt  g      af g       cout  lt  lt  g      return 0

[c++] "&" meaning after variable type

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