#include <iostream>
using namespace std;

class x
{
    int a;
    int b = 7;   // default member initializer
    int c;
public:
    x() {}
    x(int a_, int c_) : a(a_), c(c_) {}
    x(int a_, int b_, int c_) : a(a_), b(b_), c  (c_) {}  // overrides default member initializer
    void print() const { cout << a << ' ' << b << ' ' << c << endl;}
};

int main()
{
    x obj1a;
    obj1a.print();
    x obj1b();      // looks like a prototype
    x obj1c{};      // OK in C++11
    obj1c.print();

    x obj2(6,8);
    obj2.print();

    x obj3a(1,2,3);
    obj3a.print();
    x obj3b{5,6,7};
    obj3b.print();
}

*********  OUTPUT  ********* 4309728 7 4309822                // first and third values are random -2 7 1946580061                    // first and third values are random 6 7 8 1 2 3 5 6 7