Java Math ceil example

Java math ceil function is used to get smallest integer which is greater than number.

Real life example

Let’s say a telephone company charges you 1 dollar per minute. When you talk to someone for 1 minute 5 seconds, it will still charge you 2 dollar for that call. So telephone company can use Math.ceil function to get 2 minutes from 1 minutes 5 seconds.

Syntax

public static double ceil(double x) 

Example

Let’s use math’s ceil function in the example.

package org.arpit.java2blog;

public class MathCeilMain {

    public static void main(String[] args) {

        // Use math.ceil to get smaller integer greater
        // than number
        System.out.println("Ceil value for 2.6 = " + Math.ceil(2.6));
        System.out.println("Ceil value for 26.1 = " + Math.ceil(26.1));
        System.out.println("Ceil value for -0.8 = " + Math.ceil(-0.8));
        System.out.println("Ceil value for -6.2 = " + Math.ceil(-6.2));

        float f=4.6f;
        System.out.println("Ceil value for 4.6f = " + Math.ceil(f));    

    }
}

When you run above program, output of the program will be:

Few points about Math.ceil function:

• In case of Nan or infinity or zero, it will give you same result as argument.
• If you pass a value which is already equal to integer, it will result in same value.

That’s all about Java math ceil function.