java.lang.Math.signum(double d) java.lang.Math.scalb(float f,int scaleFactor) java.lang.Math.signum(float f) java.lang.Math.signum(double d) package com.codingdict; import java.lang.*; public class MathDemo { public static void main(String[] args) { // get two double numbers double x = 50.14; double y = -4; // call signum for both doubles and print the result System.out.println("Math.signum(" + x + ")=" + Math.signum(x)); System.out.println("Math.signum(" + y + ")=" + Math.signum(y)); } } java.lang.Math.scalb(float f,int scaleFactor) java.lang.Math.signum(float f)