Re: Math.Floor

Jeffrey Schwab <>
Sat, 14 Oct 2006 19:04:44 GMT
Tukewl4u wrote:

 > An Application of method.floor is rounding a value to the nearest
 > integer. The statement y = math.floor( x + 0.5 ); will round the
 > number x to the nearest integer and assign the result to y. Write an
 > application that reads double value and uses the preceding statement
 > to round each of the numbers to the nearest integer. For each number
 > proceeded, display both the original number and rounded number.

Here's what I have so far. Am I on the right direction? Thanks

You're off to a good start. There are some issues already, though. The
RoundFinder class cannot be run as a stand-alone program, for example,
since it has no main method.

import java.util.Scanner;

public class RoundFinder
  public void determineRound()
     Scanner input = new Scanner( );

Good idea using a Scanner. It is probably the easiest way to get the
doubles. The reason I don't care to use it is that you lose the
formatting of the original input, but preserving the input formatting is
not one of the requirements of your assignment, anyway.

     System.out.print("Enter three values seperated by spaces: ");

"Separated," not "seperated."

     double number1 = input.nextDouble();
     double number2 = input.nextDouble();
     double number3 = input.nextDouble();

     double result = round( number1, number2, number3 );

     System.out.println( "Rounded Value is : " + result);

Don't forget to output the original value, too. That was part of the


public double round ( double x, double y, double z)

  double roundValue = Math.round( x + 0.5);

That should be Math.floor, not Math.round.

  if ( y > roundValue )
      roundValue = y;

  //if ( z > maximumValue )
    // maximumValue = z;

Are y and z supposed to be the minimum and maximum permissible values?
If so, you probably want to give them more descriptive names and
comments. It also might be better to do the checking on the original,
input values if possible, rather than the rounded values, but that will
depend on what you want to achieve.

  return roundValue;

I like to define the main function last.

     public static void main(String[] args) {
         new RoundFinder().determineRound();


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