C# Program to Convert Binary to Decimal

This is a C# Program to perform binary to decimal conversion.

Problem Description

This C# Program Performs Binary to Decimal Conversion.

Problem Solution

This C# Program converts the given binary number into decimal. The program reads the binary number, does a modulo operation to get the remainder, multiples the total by base 2 and adds the modulo and repeats the steps.

Program/Source Code

Here is source code of the C# Program to Perform Binary to Decimal Conversion.The C# program is successfully compiled and executed with Microsoft Visual Studio.The program output is also shown below.

 * C# Program to Perform Binary to Decimal Conversion
using System;
using System.Collections.Generic;
using System.Text;
namespace Program
    class Program
        static void Main(string[] args)
            int num, binary_val, decimal_val = 0, base_val = 1, rem;
            Console.Write("Enter a Binary Number(1s and 0s) : ");
            num = int.Parse(Console.ReadLine()); /* maximum five digits */
            binary_val = num;
            while (num > 0)
                rem = num % 10;
                decimal_val = decimal_val + rem * base_val;
                num = num / 10 ;
                base_val = base_val * 2;
            Console.Write("The Binary Number is : "+binary_val);
            Console.Write("\nIts Decimal Equivalent is : "+decimal_val);
Program Explanation

In this C# program we are reading a binary number using ‘num’ variable. While loop is used to check the value of ‘num’ variable is greater than 0. If the condition is true then execute the iteration of the loop.


Compute the modulus of the value of ‘num’ variable by 10 and assign the value to ‘rem’ variable. Multiply the value with the value of ‘baseval’ variable. Add the resulted value with the value of ‘decimal_val’ variable.

Divide the value of ‘num’ variable by 10. Multiply the value of ‘base_val’ variable with 2 and assign the value to base_val variable. Print the decimal value of a binary number.

Runtime Test Cases
Enter a Binary Number(1s and 0s) : 101010
The Binary Number is : 101010
Its Decimal Equivalent is : 42

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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