How to convert Octal number to Decimal number in Java?

Problem Description :

Write a program in Java that converts Octal number to Decimal number.

Java program that converts octal number to decimal number.

Octal to Decimal conversion

Concept :

Click here to learn how to convert octal number to decimal number Mathematically.

Java Program :

package com.javamultiplex.baseconversion; import java.util.Scanner; /** * * @author Rohit Agarwal * @category Base Conversion * @problem Convert Octal to Decimal * */ public class OctalToDecimal { public static void main(String[] args) { Scanner input = null; try { input = new Scanner(System.in); System.out.println("Enter octal number : "); String number = input.next(); if (isOctalNumber(number)) { int decimal = getDecimalNumber(number); System.out.println("Decimal Number : " + decimal); } else { System.out.println("Please enter valid octal number."); } } finally { if (input != null) { input.close(); } } } private static int getDecimalNumber(String number) { // Converting String to StringBuilder. StringBuilder string = new StringBuilder(number); string = string.reverse(); int length = string.length(); int digit, power, sum = 0; for (int i = 0; i < length; i++) { digit = string.charAt(i) - 48; power = (int) Math.pow(8, i); sum = sum + digit * power; } return sum; } private static boolean isOctalNumber(String number) { /* * Regular expression that matches string containing only octal * digits[0-7]. */ String pattern = "^[0-7]+$"; boolean result = false; if (number.matches(pattern)) { result = true; } return result; } }

Output :

Output - How to convert Octal number to Decimal number in Java?

References :

https://en.wikipedia.org/wiki/Regular_expression

http://docs.oracle.com/javase/7/docs/api/java/lang/String.html

https://docs.oracle.com/javase/7/docs/api/java/lang/StringBuilder.html

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Tags : Conversion problems, Octal to Decimal, Solution in Java, String, StringBuilder, Regular expressions, for loop, if else statement.

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How to convert Octal number to Decimal number in Java?

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