Examples of java.lang.Math Methods

public class MathLibraryExample {

  public static void main(String args[]) {
    
    int i = 7;
    int j = -9;
    double x = 72.3;
    double y = 0.34;
  
    System.out.println("i is " + i);     
    System.out.println("j is " + j);
    System.out.println("x is " + x);     
    System.out.println("y is " + y);
     
    // The absolute value of a number is equal to 
    // the number if the number is positive or 
    // zero and equal to the negative of the number 
    // if the number is negative.
 
    System.out.println("|" + i + "| is " + Math.abs(i));     
    System.out.println("|" + j + "| is " + Math.abs(j));
    System.out.println("|" + x + "| is " + Math.abs(x));     
    System.out.println("|" + y + "| is " + Math.abs(y));

    // Truncating and Rounding functions
 
    // You can round off a floating point number  
    // to the nearest integer with round()
     System.out.println(x + " is approximately " + Math.round(x));     
     System.out.println(y + " is approximately " + Math.round(y));     

    // The "ceiling" of a number is the   
    // smallest integer greater than or equal to
    // the number. Every integer is its own 
    // ceiling.
     System.out.println("The ceiling of " + i + " is " + Math.ceil(i));     
     System.out.println("The ceiling of " + j + " is " + Math.ceil(j));
     System.out.println("The ceiling of " + x + " is " + Math.ceil(x));     
     System.out.println("The ceiling of " + y + " is " + Math.ceil(y));

     // The "floor" of a number is the largest  
     // integer less than or equal to the number.
     // Every integer is its own floor.
     System.out.println("The floor of " + i + " is " + Math.floor(i));     
     System.out.println("The floor of " + j + " is " + Math.floor(j));
     System.out.println("The floor of " + x + " is " + Math.floor(x));     
     System.out.println("The floor of " + y + " is " + Math.floor(y));

     // Comparison operators

     // min() returns the smaller of the two arguments you pass it
     System.out.println("min(" + i + "," + j + ") is " + Math.min(i,j));     
     System.out.println("min(" + x + "," + y + ") is " + Math.min(x,y));     
     System.out.println("min(" + i + "," + x + ") is " + Math.min(i,x));     
     System.out.println("min(" + y + "," + j + ") is " + Math.min(y,j));     

     // There's a corresponding max() method 
     // that returns the larger of two numbers 
     System.out.println("max(" + i + "," + j + ") is " + Math.max(i,j));     
     System.out.println("max(" + x + "," + y + ") is " + Math.max(x,y));     
     System.out.println("max(" + i + "," + x + ") is " + Math.max(i,x));     
     System.out.println("max(" + y + "," + j + ") is " + Math.max(y,j));     
      
     // The Math library defines a couple 
     // of useful constants:
     System.out.println("Pi is " + Math.PI);     
     System.out.println("e is " + Math.E);       
     // Trigonometric methods
    // All arguments are given in radians
 
    // Convert a 45 degree angle to radians
    double angle = 45.0 * 2.0 * Math.PI/360.0;
    System.out.println("cos(" + angle + ") is " + Math.cos(angle));     
    System.out.println("sin(" + angle + ") is " + Math.sin(angle));     
    
     // Inverse Trigonometric methods
     // All values are returned as radians
   
    double value = 0.707;

    System.out.println("acos(" + value + ") is " + Math.acos(value));     
    System.out.println("asin(" + value + ") is " + Math.asin(value));     
    System.out.println("atan(" + value + ") is " + Math.atan(value));     

    // Exponential and Logarithmic Methods
  
    // exp(a) returns e (2.71828...) raised 
    // to the power of a.   
    System.out.println("exp(1.0) is " + Math.exp(1.0));
    System.out.println("exp(10.0) is " + Math.exp(10.0));
    System.out.println("exp(0.0) is " +  Math.exp(0.0));

    // log(a) returns  the natural 
    // logarithm (base e) of a. 
    System.out.println("log(1.0) is " + Math.log(1.0));
    System.out.println("log(10.0) is " + Math.log(10.0));
    System.out.println("log(Math.E) is " + Math.log(Math.E));

    // pow(x, y) returns the x raised 
    // to the yth power.
    System.out.println("pow(2.0, 2.0) is " + Math.pow(2.0,2.0));
    System.out.println("pow(10.0, 3.5) is " + Math.pow(10.0,3.5));
    System.out.println("pow(8, -1) is " + Math.pow(8,-1));

    // sqrt(x) returns the square root of x.
    for (i=0; i < 10; i++) {
      System.out.println(
       "The square root of " + i + " is " + Math.sqrt(i));
    }

       
    // Finally there's one Random method 
    // that returns a pseudo-random number 
    // between 0.0 and 1.0;
    
    System.out.println("Here's one random number: " + Math.random());     
    System.out.println("Here's another random number: " + Math.random());

  }

}