public class DemoMath
{
    public static void main(String[] args)
    {
        int a = -5;
        int b = 2;
        System.out.println(a);
        System.out.println(Math.abs(a));

        System.out.println(a + ", " + b);
        System.out.println(Math.max(a,b));

        System.out.println(a + ", " + b);
        System.out.println(Math.pow(a,b));

        System.out.println(Math.PI);
    }
}