Java ceil() method with Examples

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The java.lang.Math.ceil() returns the double value that is greater than or equal to the argument and is equal to the nearest mathematical integer.

Note:

If the argument is Integer, then the result is Integer.

If the argument is NaN or an infinity or positive zero or negative zero, then the result is the same as the argument.

If the argument value is less than zero but greater than -1.0, then the result is negative zero.

Syntax:

public static double ceil(double a)
a : the argument whose ceil value is to be determined

Returns : This method returns the double value that is greater than or equal to the argument and is equal to the nearest mathematical integer.

Example 01:To show working of java.lang.Math.ceil() method.

java

// Java program to demonstrate working
// of java.lang.Math.ceil() method
import java.lang.Math;
 
class Gfg {
 
    // driver code
    public static void main(String args[])
    {
        double a = 4.3;
        double b = 1.0 / 0;
        double c = 0.0;
        double d = -0.0;
        double e = -0.12;
 
        System.out.println(Math.ceil(a));
 
        // Input Infinity, Output Infinity
        System.out.println(Math.ceil(b));
 
        // Input Positive Zero, Output Positive Zero
        System.out.println(Math.ceil(c));
 
        // Input Negative Zero, Output Negative Zero
        System.out.println(Math.ceil(d));
 
        // Input  less than zero but greater than -1.0
        // Output Negative zero
        System.out.println(Math.ceil(e));
    }
}

Output:

5.0
Infinity
0.0
-0.0
-0.0

Example 02: To show the working of ceil() with a positive double value

Java

import java.io.*;
 
class GFG {
    public static void main (String[] args) {
        double number = 3.5;
        double result = Math.ceil(number);
        System.out.println(result);  // Output: 4.0
 
    }
}