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Java rint Function

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The Java rint Function is one of the Java Math Library function which is used to round the specified expression or an individual number to nearest mathematical integer. In this article we will show you, How to use Java Math.rint function with example.

Java rint Function syntax

The basic syntax of the Math.rint Function in Java Programming language is as shown below.

static double rint(double number); //Return Type is Double

// In order to use in program: 
Math.rint(double number);

Number: It can be a double value or a valid numerical expression.

  • If the number argument is positive or negative number, Math.rint function will return the nearest value.
  • If the number argument is not a number (NaN) or infinity or positive zero or negative zero then, Java Math.rint function will return the argument value as a result

Java Math.rint Function Example

The Java Math.rint function is used to round the double value to nearest integer. In this Java program, We are going to round the values of both positive and negative values and display the output

JAVA CODE

package MathFunctions;

public class RintMethod {
	public static void main(String[] args) {
		double a = Math.rint(140.456 - 34.9865 - 4.52);
		System.out.println("Math.rint Result = " + a);

		System.out.println("\nMath.rint Result of Positive Number: " + Math.rint(0.25));
		System.out.println("Math.rint Result of Positive Number: " + Math.rint(12.05));
		System.out.println("Math.rint Result of Positive Number: " + Math.rint(12.85));
		
		System.out.println("\nMath.rint Result of Negative Number: " + Math.rint(-10.85));
		System.out.println("RMath.rint Result of Negative Number: " + Math.rint(-10.25));
	}
}

OUTPUT

Java rint Function 1

ANALYSIS

First, We declared variable of type Double and performed the Java rint function directly on expression.

double a = Math.rint(140.456 - 34.9865 - 4.52);
System.out.println("Math.rint Result = " + a);

Next, We used the Math.rint Function directly on Positive double values.

System.out.println("\nMath.rint Result of Positive Number: " + Math.rint(0.25));
System.out.println("Math.rint Result of Positive Number: " + Math.rint(12.05));
System.out.println("Math.rint Result of Positive Number: " + Math.rint(12.85));

Next, We used the Math.rint Function directly on Negative double values.

System.out.println("\nMath.rint Result of Negative Number: " + Math.rint(-10.85));
System.out.println("RMath.rint Result of Negative Number: " + Math.rint(-10.25));

Java Math.rint on Array example

In this Java program we will show you, How to find the rounded values of bulk data. Here, we are going to declare an array of double type and find the closest (rounded) values of an array elements.

JAVA CODE

package MathFunctions;

public class RintMethodOnArrays {
	public static void main(String[] args) {
		
		double [] rintArray = {-19.25, 110.98, 144.21, -120.59, -605.87, 38.4897};

		for (int i = 0; i < rintArray.length; i++) {
			System.out.println("Math.rint Result of Array Element = " + Math.rint(rintArray[i]));
		}
	}
}

OUTPUT

Java rint Function 2

ANALYSIS

First, We declared an array of double type and assigned some random values.

double [] rintArray = {-19.25, 110.98, 144.21, -120.59, -605.87, 38.4897};

Next, We used the Java For Loop to iterate the Array. Within the For Loop, we initialized the i value as 0. Next, compiler will check for the condition (i < rintArray.length). As along the condition is True statement inside the for loop will be executed.

TIP: rintArray.length is used to find the length of an array.

for (int i = 0; i < rintArray.length; i++) {

Following statements will print the output. If you observe the code snippet, we used the Math.rint Function directly inside the System.out.format statement. Here, compiler will call the Java rint method ( static double rint(double number) ) to find the corresponding closet values.

System.out.println("Math.rint Result of Array Element = " + Math.rint(rintArray[i]));

NOTE: If you want to find the closet value of a single item then use: Math.rint(myArray[index_position])

Java Math.rint function on Arraylist example

In this Java program we are going to declare an arraylist of double type and find the closet values of list elements.

JAVA CODE

package MathFunctions;

import java.util.ArrayList;

public class RintMethodOnList {
	public static void main(String[] args) {
		
		ArrayList<Double> myList = new ArrayList<Double>(5);
		myList.add(-2.289);
		myList.add(-2.65);
		myList.add(Math.PI);
		myList.add(59.05);
		myList.add(33.568);
		
		for (double x : myList) {
			System.out.println("Math.rint Result of ArrayList =  " + Math.rint(x));
		}
	}
}

OUTPUT

Java rint Function 3

ANALYSIS

Within this Java rint function example, First, We declared an ArrayList of double type and assigned some random values.

ArrayList<Double> myList = new ArrayList<Double>(5);
myList.add(-2.289);
myList.add(-2.65);
myList.add(Math.PI);
myList.add(59.05);
myList.add(33.568);

Next, We used the For Loop to iterate the double values in ArrayList

for (double x : myList) {

Following statements will print the output. If you observe the code snippet, we used the Math.rint Function directly inside the System.out.format statement. Here, compiler will call the java math.rint method ( static double rint(double x) ) to find the corresponding closest values.

System.out.println("Math.rint Result of ArrayList =  " + Math.rint(x));

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