Java - Math ceil(double) method



Description

The Java Math ceil(double a) returns the smallest (closest to negative infinity) double value that is greater than or equal to the argument and is equal to a mathematical integer. Special cases −

  • If the argument value is already equal to a mathematical integer, then the result is the same as the argument.

  • 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.

Note that the value of Math.ceil(x) is exactly the value of -Math.floor(-x).

Declaration

Following is the declaration for java.lang.Math.ceil() method

public static double ceil(double a)

Parameters

a − a value.

Return Value

This method returns the smallest (closest to negative infinity) floating-point value that is greater than or equal to the argument and is equal to a mathematical integer.

Exception

NA

Example 1

The following example shows the usage of Math ceil() method.

package com.tutorialspoint;
public class MathDemo {
   public static void main(String[] args) {

      // get a double number
      double x = 10.7;

      // print the ceil of the number
      System.out.println("Math.ceil(" + x + ")=" + Math.ceil(x));
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Math.ceil(10.7)=11.0

Example 2

The following example shows the usage of Math ceil() method of zero value.

package com.tutorialspoint;
public class MathDemo {
   public static void main(String[] args) {

      // get a double number
      double x = 0.0;

      // print the ceil of the number
      System.out.println("Math.ceil(" + x + ")=" + Math.ceil(x));
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Math.ceil(0.0)=0.0

Example 3

The following example shows the usage of Math ceil() method of a negative number.

package com.tutorialspoint;
public class MathDemo {
   public static void main(String[] args) {

      // get a double number
      double x = -10.7;

      // print the ceil of the number
      System.out.println("Math.ceil(" + x + ")=" + Math.ceil(x));
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Math.ceil(-10.7)=-10.0
java_lang_math.htm
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