2026 03 18 Pencil Easy

// create a new blue pencil with 18.6mm of lead remaining
Pencil p = new Pencil("Blue",18.6)

// use 2.1mm of lead to write, leaving 16.5mm
p.writeAt(2.1);

double len = p.long();
// len == 16.5

String d = p.describe();
// d is "blue pencil, 16.5mm"