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Program on Decimal to Octal Number Conversion


Write a Program in Java to input a number in Decimal number system and convert it into its equivalent number in the Octal number system.

Note: Octal Number system is a number system which can represent a number in any other number system in terms of digits ranging from 0 to 7 only. This number system consists of only eight basic digits i.e. 0, 1, 2, 3, 4, 5, 6 and 7.

For Example: 25 in the Decimal number system can be represented as 31 in the Octal number system.

decimal to octal conversion
Figure Illustrating Decimal to Octal Number System Conversion


* The class Dec2Oct inputs a Decimal number and converts it into its equivalent Octal number
* @author :
* @Program Type : BlueJ Program - Java

class Dec2Oct
    public static void main(String args[])throws IOException
        BufferedReader br=new BufferedReader (new InputStreamReader(;
        System.out.print("Enter a decimal number : ");
        int n=Integer.parseInt(br.readLine());

        int r;
        String s=""; //variable for storing the result

        //array storing the digits (as characters) in the octal number system
        char dig[]={'0','1','2','3','4','5','6','7'};

                r=n%8; //finding remainder by dividing the number by 8
                s=dig[r]+s; //adding the remainder to the result and reversing at the same time
        System.out.println("Output = "+s);


Enter a decimal number : 25
Output = 31

Enter a decimal number : 465
Output = 721

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  1. Thank you so much!!!

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  3. how to do the above program using recursion…..???? please reply …URGENT…

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