Java Math Exercises: Round a float number to specified decimals

Java Math Exercises: Exercise-4 with Solution

Write a Java program to round a float number to specified decimals.

Sample Solution:

Java Code:

import java.lang.*;
import java.math.BigDecimal;
public class Example4 {
 public static void main(String[] args) {
        float x = 451.3256412f;
        BigDecimal result;
		int decimal_place = 4;
		BigDecimal bd_num = new BigDecimal(Float.toString(x));
        bd_num = bd_num.setScale(decimal_place, BigDecimal.ROUND_HALF_UP); 
		System.out.printf("Original number: %.7f\n",x);
        System.out.println("Rounded upto 4 decimal: "+bd_num);

Sample Output:

Original number: 451.3256531                                           
Rounded upto 4 decimal: 451.3257


Flowchart: Round a float number to specified decimals.

Java Code Editor:

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Java: Tips of the Day

Parsing dates:

import java.io.*;
import java.util.*;
import java.text.*;

String s = "2001/09/23 14:39";

SimpleDateFormat formatter = new SimpleDateFormat ("yyyy/MM/dd H:mm");
Date d = formatter.parse(s, new ParsePosition(0));