import std.stdio;

​

void main() {

    double[] x;

    writeln(x.length);

    writeln(x.capacity);

    x.reserve(50);

    writeln(x.length);

    writeln(x.capacity);

    x ~= 1.5;

    writeln(x);

    double[] y;

    y.length = 50;

    writeln(y.length);

    writeln(y.capacity);

    y ~= 1.5;

    writeln(y);

}