## How to round a number?

The example below show you some methods of the `Math`

class that can be use to round the value of a number. These methods are `Math.ceil()`

, `Math.floor()`

and `Math.round()`

.

package com.javacoderanch.example.math;
public class GetRoundingValueExample {
public static void main(String[] args) {
Double number = 1.5D;
//
// Get the smallest value that is greater than or equal to the
// argument and is equal to a mathematical integer
//
double roundUp = Math.ceil(number);
System.out.println("Result of rounding up of " + number + " = " + roundUp);
//
// Get the largest value that is less than or equal to the
// argument and is equal to a mathematical integer
//
double roundDown = Math.floor(number);
System.out.println("Result of rounding down of " + number + " = " + roundDown);
//
// Get the closest long value to the argument
//
long round1 = Math.round(number);
System.out.println("Rounding result of " + number + " (in long) = " + round1);
//
// Get the closest int value to the argument
//
int round2 = Math.round(number.floatValue());
System.out.println("Rounding result of " + number + " (in int) = " + round2);
}
}

Here are the result of the program:

Result of rounding up of 1.5 = 2.0
Result of rounding down of 1.5 = 1.0
Rounding result of 1.5 (in long) = 2
Rounding result of 1.5 (in int) = 2