# Java Program To Round The Number To N Decimal Places

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## Program To Round The Number To N Decimal Places

In this article we will see how we can round a number to N decimal places.

Concept:

We can round decimal number  to a certain accuracy or n number of decimal places. It is used when we want to  make calculation easier & makes results easier to understand, it is applicable only when exact values are not too important.

For example:

A number is 231.434343545 and we didn’t want the exact value , in that case we can reduce the floating part to 2 or 3 decimal places, which will make the number simpler and further simple use.

After rounding that number to 2 decimal places,  the number will be à 231.43
After rounding that number to 3 decimal places,  the number will be à 231.434

Now we will see one by one approach

### Method 1 : Java program to round the number to n decimal places by using formatting approach

We can round the decimal number to n decimal places by using formatting approach.

Approach:

• Enter a decimal number.
• Print the decimal number by formatting approach (using %df).

Program:

import java.util.Scanner;
public class Main
{
public static void main(String[] args)
{
// CREATING OBJECT
Scanner sc = new Scanner(System.in);
// TAKING STRING FORM USER
System.out.println("Enter number: ");
double n= sc.nextDouble();
// rounding number to 2 decimal places
System.out.println("number: " + n);
System.out.format("\n after rounding : %.3f", n);
}
}

Output:

Enter number: 231.32525325
number: 231.32525325
after rounding : 231.325

### Method 2 : Java program to round the number to n decimal places DecimalFormat class

We can round the decimal number to n decimal places by using DecimalFormat class approach . This class is a child class of NumberFormat . In this we create an object of this class and pass  the arguments as the format specified in form of ”#”, with the number of # after the decimal point , which indicate how many n places we want to store after the decimal point .

Approach:

• Enter a decimal number .
• Create a object of DecimalFormat by giving the ‘N‘ no of ‘#‘ after the “.” (Ex- #.####)
• Print the decimal number by the method  format ().

Program:

import java.util.Scanner;
import java.text.DecimalFormat;
public class Main
{
public static void main(String[] args)
{
// CREATING OBJECT
Scanner sc = new Scanner(System.in);
// TAKING STRING FORM USER
System.out.print("Enter number: ");
double n= sc.nextDouble();
//creating obj. of the DecimalFormat
DecimalFormat d = new DecimalFormat("#.####");
System.out.print("number: " + n);
System.out.print("\nafter rounding : " + d.format(n));
}
}

Output:

Enter number: 231.32525325
number: 231.32525325
after rounding : 231.3252

### Method 3 : Java program to round the number to n decimal places using BigDecimal class

We can round the decimal number to n decimal places by using BigDecimal class approach .

Approach:

• Enter a decimal number .
• Create a object of BigDecimal class.
• Round up the number by using setcsale() method .
• Print that value .

Program:

import java.math.RoundingMode;
import java.util.Scanner;
import java.math.BigDecimal;
public class Main
{
public static void main(String[] args)
{
// CREATING OBJECT
Scanner sc = new Scanner(System.in);
// TAKING STRING FORM USER
System.out.print("Enter number: ");
double n= sc.nextDouble();
System.out.print("Enter how many places you want : ");
int a= sc.nextInt();
//creating obj. of the bigdecimal
BigDecimal bd = new BigDecimal(Double.toString(n));
// rounding the value to desire n places
bd = bd.setScale(a, RoundingMode.HALF_UP);
System.out.print("number: " + n);
System.out.print("\nafter rounding : " + bd);
}
}


Output:

Enter number: 123.123456
Enter how many places you want : 4
number: 123.123456
after rounding : 123.1235

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