// integer division, named constants

public class MathOps
  /** This class demonstrates using the Math class    
    * We discussed pow, sqrt, round, random  **/
{
  public static void main(String[] args)
  {   
    System.out.println("2^120 is " + Math.pow(2,120));
    
    // used a formula and got that your room fits 37.3 people
    // you want to put that into an integer variable
    // double gets TRUNCATED
    int numPeople = (int)37.99999; // type cast (forced conversion)
    System.out.println("numPeople is: " + numPeople);
    
    // if we want to round a number, call Math.round
    double grade = 88.5;
    System.out.println("Grade is: " + Math.round(grade));
    
    // int num = "Hello World";  incompatible types
    double y=0; // widening conversion is OK in Java
    
 /* This example source code demonstrates the use of  
 * random() method of Math class
 * Generating random numbers from 1 to 6 (ex: spinning a die)
 */

  
    // define the range
    int max = 6;
    int min = 1;
    int range = max - min + 1;  
  
  // generate random number from 1 to 10
    int rand = (int) (Math.random()* range) + min;
    System.out.println("You spun: " + rand);
    
    
    // this is an example of losing precision with doubles
    double sum=0.0;
    sum = .1+.1+.1+.1+.1+.1+.1+.1+.1+.1;
    System.out.println("sum="+sum); 
    
    // integer division
    double answer = sum/5;  // division of doubles 
    answer = 1/2; 
    System.out.println("answer of 1/2 is: " + answer);
    
    
    
    
  }
}