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StrictMath ceil() Method in Java with Examples

Last Updated : 11 Jul, 2025

All methods of java.lang.StrictMath class : Set 1, Set 2
The java.lang.StrictMath.ceil() is an inbuilt method in Java is used to return the smallest double value, greater than or equal to the given double argument and equal to an integer. It gives rise to three special results: 

• The result is the same as the argument when the given argument is equal to the integer.
• The result is the same as the argument when the given argument is NaN, infinity, positive zero or negative zero.
• The result is a negative 0 when the given argument is less than 0 and greater than -1.0.

Syntax:  

public static double ceil(double num)

Parameters: The method accepts one parameter num of double type whose ceiling value is to be returned.
Return Value: The method returns the smallest floating-point value which is closest to negative infinity and is greater than or equal to the given argument and also equal to the integer.
Examples :  

Input: num = 2.7
Output: 3.0

Input: num = -8.7
Output: -8.0

Below programs illustrate the java.lang.StrictMath.ceil() method: 
Program 1: 

// Java program to illustrate the
// java.lang.StrictMath.ceil()
import java.lang.*;

public class Geeks {

    public static void main(String[] args)
    {

        double num1 = 8.7, num2 = 7.1, num3 = 3.5;

        // It returns ceiling value
        double cValue = StrictMath.ceil(num1);
        System.out.println("The Ceil value of "+
                             num1+" = " + cValue);

        cValue = StrictMath.ceil(num2);
        System.out.println("The Ceil value of "+
                             num2+" = " + cValue);

        cValue = StrictMath.ceil(num3);
        System.out.println("The Ceil value of "+
                             num3+" = " + cValue);
    }
}

The Ceil value of 8.7 = 9.0
The Ceil value of 7.1 = 8.0
The Ceil value of 3.5 = 4.0

Program 2: 

// Java program to illustrate the
// java.lang.StrictMath.ceil()
import java.lang.*;

public class Geeks {

    public static void main(String[] args)
    {

        double num1 = -8.7, num2 = -7.1, num3 = -3.5;

        // It returns ceiling value
        double cValue = StrictMath.ceil(num1);
        System.out.println("The Ceil value of "+
                             num1+" = " + cValue);

        cValue = StrictMath.ceil(num2);
        System.out.println("The Ceil value of "+
                             num2+" = " + cValue);

        cValue = StrictMath.ceil(num3);
        System.out.println("The Ceil value of "+
                             num3+" = " + cValue); 
   }
}

The Ceil value of -8.7 = -8.0
The Ceil value of -7.1 = -7.0
The Ceil value of -3.5 = -3.0

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