Different Math Function in Java Program

public class mathclass{
    public static void main(String[] args){
        //E and round()
        Double a = Math.E;
        System.out.println("e = " + Math.round(a*100)/100f);
        //PI
        System.out.println("pi = " + Math.round(Math.PI*100)/100f);
        //abs()
        System.out.println("Absolute number = " + Math.abs(Math.PI));
        //ceil()
        System.out.println("Smallest integer value but greater than the argument = " + Math.ceil(Math.PI));
        //exp()
        System.out.println("Exponent number powered by the argument = " + Math.exp(0));
        //floor()
        System.out.println("Largest integer value but less than the argument = " + Math.floor(Math.E));
        //IEEEremainder()
        System.out.println("Remainder = " + Math.IEEEremainder(5.3f,2.2f));
        //max()
        System.out.println("Maximum Number = " + Math.max(10,10.3));
        //min()
        System.out.println("Minimum Number = " + Math.min(10,10.3));
        //pow()
        System.out.println("Power = " + Math.pow(10,3));
        //random()
        System.out.println("Random Number = " + Math.random());
        //rint()
        System.out.println("Closest to the Argument = " + Math.rint(30));
        //round()
        System.out.println("Round = " + Math.round(Math.E));
        //sqrt()
        System.out.println("Square Root = " + Math.sqrt(400));
    }
}