public class Child {
    private String name;
    private double mass;
    private int height;
    
    /**
     * A Child with name n, height in centimetres h,
      * and mass in kilograms w.
     */
    public Child(String n, double m, int h) {
        name = n;
        height = h;
        mass = m;
    }
    
    /**
     * = "this Child is the same height as c, and
     * has the same mass to within 0.25 kg."
     * @param c the Child to compare to this Child.
     */
    public boolean equals(Child c) {
        return c != null && height == c.height
            && Math.abs(mass - c.mass) <= 0.25;
    }
    
}