Java Program to Convert Octal Number to Decimal

 Example 1: Program to Convert Decimal to Octal

public class DecimalOctal {

    public static void main(String[] args) {

        int decimal = 78;

        int octal = convertDecimalToOctal(decimal);

        System.out.printf("%d in decimal = %d in octal", decimal, octal);

    }

    public static int convertDecimalToOctal(int decimal)

    {

        int octalNumber = 0, i = 1;

        while (decimal != 0)

        {

            octalNumber += (decimal % 8) * i;

            decimal /= 8;

            i *= 10;

        }

        return octalNumber;

    }

}

Example 2: Program to Convert Octal to Decimal

public class OctalDecimal {

    public static void main(String[] args) {

        int octal = 116;

        int decimal = convertOctalToDecimal(octal);

        System.out.printf("%d in octal = %d in decimal", octal, decimal);

    }

    public static int convertOctalToDecimal(int octal)

    {

        int decimalNumber = 0, i = 0;

        while(octal != 0)

        {

            decimalNumber += (octal % 10) * Math.pow(8, i);

            ++i;

            octal/=10;

        }

        return decimalNumber;

    }

}

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