Common objects in Java--math

Math:

The class used for mathematical operations.

Member variables:

public static final Double PI

public static final Double E

Member Methods:

public static int abs (int a): absolute Value

public static double Ceil (double A): Rounding up

public static double floor (double A): Rounding down

public static int max (int a,int b): max (min self-study )

public static Double pow (double a,double b): Power of b of a

public static Double Random (): random number [0.0,1.0]

public static int round (float a) rounded ( self-study with double argument )

public static double sqrt (double A): positive square root

Demo

public class Mathdemo { public static void Main (string[] args) { public static final Double PI System.out.println ("PI:" + Math.PI); public static final Double E System.out.println ("E:" + MATH.E); System.out.println ("--------------"); public static int abs (int a): absolute Value System.out.println ("ABS:" + Math.Abs (10)); System.out.println ("ABS:" + math.abs (-10)); System.out.println ("--------------"); public static double Ceil (double A): Rounding up System.out.println ("Ceil:" + Math.ceil (12.34)); System.out.println ("Ceil:" + Math.ceil (12.56)); System.out.println ("--------------"); public static double floor (double A): Rounding down System.out.println ("Floor:" + Math.floor (12.34)); System.out.println ("Floor:" + Math.floor (12.56)); System.out.println ("--------------"); public static int max (int a,int b): Maximum Value System.out.println ("Max:" + Math.max (12, 23)); requirement: I want to get the maximum value in three data nested calls to methods System.out.println ("Max:" + Math.max (Math.max (12, 23), 18)); requirement: I want to get the maximum value in four data System.out.println ("Max:" + Math.max (Math.max (), Math.max (34, 56)); System.out.println ("--------------"); public static Double pow (double a,double b): Power of b of a System.out.println ("POW:" + Math.pow (2, 3)); System.out.println ("--------------"); public static Double Random (): random number [0.0,1.0] System.out.println ("Random:" + math.random ()); get a random number between 1-100 System.out.println ("Random:" + ((int) (Math.random () * 100) + 1)); System.out.println ("--------------"); public static int round (float a) rounded ( self-study with double argument ) System.out.println ("Round:" + math.round (12.34f)); System.out.println ("Round:" + math.round (12.56f)); System.out.println ("--------------"); public static double sqrt (double A): positive square root System.out.println ("sqrt:" +math.sqrt (4)); } }

Please design a method that can achieve random numbers in any range.

Demo Requirements: Please design a method that can achieve random numbers in any range. Analysis: A: keyboard input two data. int strat; int end; B: find a way to get the random number between start and end I write a function to achieve this effect and get a random number. (int) C: Output This random number

public class Mathdemo { public static void Main (string[] args) { Scanner sc = new Scanner (system.in); System.out.println (" Please enter start number:"); int start = Sc.nextint (); System.out.println (" Please enter end number:"); int end = Sc.nextint (); for (int x = 0; x < + × x + +) { Invoke function int num = Getrandom (start, end); Output Results SYSTEM.OUT.PRINTLN (num); } } /* * Write a function two explicit: return value type:int argument list:int start,int End */ public static int Getrandom (int start, int end) { recall the random number between the 1-100 we talked about. int number = (int) (Math.random () * 100) + 1; int number = (int) (Math.random () * end) + start; found a problem, how to do it ? int number = (int) (Math.random () * (End-start + 1)) + start; return number; } }

Common objects in Java--math