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  1. or download this
    $ cat a.cpp
    #include <stdio.h>
    ...
    
    $ g++ -o a a.cpp && a
    5,6
    
  2. or download this
    int i = 5;
    
  3. or download this
    int i(5);
    
  4. or download this
    Point(int a_x, int a_y) : x(a_x), y(a_y) {}
    
  5. or download this
    Point(int a_x, int a_y) { x = a_x; y = a_y; }