Round numbers to whole number without using the Math.round

Question:

How to round decimals to whole number, without using the Math.round or ceiling program?

Answer:

You can do it with casting.

Code:

import java.util.Scanner; 
 
public class Rounding {
   public static void main(String[] args) {
 
      Scanner scan = new Scanner(System.in);
 
      System.out.print("Enter double: " );
      Double d = scan.nextDouble();
      System.out.println("You entered: " + d);
      Integer i = d.intValue();
 
      if ( d - i >= .5 ) {
        i=i+1;
      }
 
      System.out.println("Rounded: " + i);
 
   }
}

Output:

$ java Rounding
Enter double: 12.4999
You entered: 12.4999
Rounded: 12


$ java Rounding
Enter double: 8.5
You entered: 8.5
Rounded: 9