import std.stdio;

struct S
{
    int a;
    int b;
};

class C
{
    int a;
    int b;
};

void main(string[] args)
{
    S s1;
    s1.a = 3;
    s1.b = 4;
    S s2 = s1;
    s2.a = 5;
    s2.b = 6;
    writefln("S: %d, %d; %d, %d", s1.a, s1.b, s2.a, s2.b);

    C c1 = new C();
    c1.a = 10;
    c1.b = 11;
    C c2 = c1;
    c2.a = 12;
    c2.b = 13;
    writefln("C: %d, %d; %d, %d", c1.a, c1.b, c2.a, c2.b);
}