Octal to Binary Conversion in C#

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Octal to Binary Conversion in C# with Examples

In this article, I am going to discuss Octal to Binary Conversion in C# with Examples. Please read our previous article, where we discussed Hexadecimal to Octal Conversion in C#. At the end of this article, you will understand, what are Octal and Binary Number Systems are and how to convert an Octal Number into its equivalent Binary Number using C#.

What is Octal Number System?

The octal numeral system or oct is the base-8 number system and uses the digits 0 to 7. Octal numerals can be made from binary numerals by grouping consecutive binary digits into groups of three (starting from the right). Example: (5303)₈

What is Binary Number System?

The binary numeral system uses the number 2 as its base (radix). As a base-2 numeral system, it consists of only two numbers 0 and 1. The binary number system is the way to represent the number in computer architecture. Example: (101101)₂

Logic to Convert Octal to Binary in C# 

To find the conversion of octal to decimal number simply we need to follow the below steps

1. First, we take the octal number.
2. Then we convert it as a decimal equivalent.
3. We convert the decimal number into their binary equivalent.
4. Then we store the number and we get the required binary number.

Example: Convert to octal number (56)₈ into binary

Solution:
Given octal number is (56)8
The equivalent binary number of 5 is: 101
The equivalent binary number of 6 is: 110

Equivalent binary number of (56)₈ is (101110)₂

For better understanding, please have a look at the below diagram which shows how to convert (56)₈ into a binary number.

Example: Octal to Binary Number Conversion in C# 

The following C# Program will convert an Octal number to its equivalent Binary number.

using System;
class OctalToBinary
{
    static void Main()
    {
        string octalNumber = "170";
        System.Console.WriteLine("Octal Number is: " + octalNumber);
        int i = 0;
        string binary = "";
        while (i < octalNumber.Length)
        {
            char c = octalNumber[i];
            switch (c)
            {
                case '0':
                    binary += "000";
                    break;
                case '1':
                    binary += "001";
                    break;
                case '2':
                    binary += "010";
                    break;
                case '3':
                    binary += "011";
                    break;
                case '4':
                    binary += "100";
                    break;
                case '5':
                    binary += "101";
                    break;
                case '6':
                    binary += "110";
                    break;
                case '7':
                    binary += "111";
                    break;
                default:
                    System.Console.WriteLine("\nInvalid Octal Digit " + octalNumber[i]);
                    break;
            }
            i++;
        }
        System.Console.WriteLine("Bianry value is: " + binary);
        Console.ReadKey();
    }
}

Output:

Example: Taking input from the user

In the following C# program, we will take the octal number from the user and then convert the octal number to its equivalent binary number and print it on the console.

using System;
public class OctalToBinary
{
    public static void Main()
    {
        long n1, n2, k = 1;
        long decimal_number = 0, i = 1, j, d;
        long binary_number = 0;
        Console.Write("Input an octal number (using digit 0 - 7) : ");
        n1 = Convert.ToInt32(Console.ReadLine());
        n2 = n1;
        for (j = n1; j > 0; j /= 10)
        {
            d = j % 10;
            if (i == 1)
                k *= 1;
            else
                k *= 8;

            decimal_number = decimal_number + (d * k);
            i++;
        }
        i = 1;

        for (j = decimal_number; j > 0; j /= 2)
        {
            binary_number = binary_number + (decimal_number % 2) * i;
            i *= 10;
            decimal_number /= 2;
        }

        Console.Write("\nThe Octal Number: {0}\nThe equivalent Binary  Number: {1} \n\n", n2, binary_number);
        Console.ReadKey();
    }
}

Output:

C# Code (Using function)

In the below example, we have created one method to convert the octal number to its equivalent binary number.

using System;
class OctalToBinary
{
    static string octalToBinary(string octalNumber)
    {
        int i = 0;
        string binary = "";
        while (i < octalNumber.Length)
        {
            char c = octalNumber[i];
            switch (c)
            {
                case '0':
                    binary += "000";
                    break;
                case '1':
                    binary += "001";
                    break;
                case '2':
                    binary += "010";
                    break;
                case '3':
                    binary += "011";
                    break;
                case '4':
                    binary += "100";
                    break;
                case '5':
                    binary += "101";
                    break;
                case '6':
                    binary += "110";
                    break;
                case '7':
                    binary += "111";
                    break;
                default:
                    System.Console.WriteLine("\nInvalid Octal Digit " + octalNumber[i]);
                    break;
            }
            i++;
        }

        return binary;
    }
    static void Main()
    {
        Console.Write("Input an octal number (using digit 0 - 7) : ");
        string octalNumber = Console.ReadLine();
        Console.WriteLine("Octal Number is : " + octalNumber);
        System.Console.WriteLine("Bianry value is: " + octalToBinary(octalNumber));
        Console.ReadKey();
    }
}

Output:

In the next article, I am going to discuss how to Convert Octal to Decimal numbers in C# with Examples. Here, in this article, I try to explain how to convert an octal number to its equivalent binary number in C# with Examples and I hope you enjoy this Octal to Binary Conversion in C# article.