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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
Getting Smallest Value Greater Than or Equal to a Positive Number Example
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
Getting Smallest Value Greater Than or Equal to Zero Example
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
Getting Smallest Value Greater Than or Equal to a Negative Number Example
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
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