public class Heater
{
    // instance variables - replace the example below with your own
    private double temperature;
    private double max, min, increment;
    public Heater(int maxinp, int mininp)
    {
        // initialise instance variables
        temperature = 15;
        increment = 5;
        max = maxinp;
        min = mininp;
    }
    public void warmer()
    {
        temperature = temperature + increment;
        if(temperature > max)
        {
            temperature = max;
        }
    }
    public void cooler()
    {
        temperature = temperature - increment;
        if(temperature < min)
        {
            temperature = min;
        }
    }
    public void setIncrement(double setinc)
    {
        if(setinc > 0)
        {
            increment = setinc;
        }
    }
}