C#: Convert a binary number into a decimal using math function

Last update on August 21 2025 12:54:21 (UTC/GMT +8 hours)

Write a C# Sharp program to convert a binary number into a decimal number using the math function.

Visual Presentation:

C# Sharp Exercises: Convert a binary number into a decimal using math function

Sample Solution:

C# Sharp Code:

using System;  // Importing necessary namespace

public class Exercise46  // Declaration of the Exercise46 class
{  
    public static void Main()  // Main method, entry point of the program
    {   
        // Declaration of variables
        int n1, n;
        double dec = 0, i = 0, d;

        // Displaying information about converting a binary number into decimal using math function
        Console.Write("\n\n");
        Console.Write("Convert a binary number into decimal using math function:\n");
        Console.Write("-----------------------------------------------------------");
        Console.Write("\n\n");	

        // Prompting user to input the binary number
        Console.Write("Input the binary number: ");
        n = Convert.ToInt32(Console.ReadLine());	

        n1 = n; // Storing the original binary number in another variable for display

        // Converting binary to decimal
        while (n != 0)
        {  
            d = n % 10;  // Extracting each digit of the binary number
            dec = dec + d * Math.Pow(2, i);  // Converting each digit to its decimal equivalent
            n = n / 10;  // Removing the last digit from the binary number
            i++;  // Incrementing the power of 2
        }

        // Displaying the original binary number and its equivalent decimal number
        Console.Write("\nThe Binary Number: {0}\nThe equivalent Decimal Number is: {1}\n\n", n1, dec);
    }
}

Sample Output:

Convert a binary number into decimal using math function:                                                   
-----------------------------------------------------------                                                                                         
Input  the binary number :1000001                                                                           
The Binary Number : 1000001                                                                                 
The equivalent Decimal  Number is : 65

Flowchart:

Go to:

PREV : Write a program in C# Sharp to find LCM of any two numbers.
NEXT : Write a C# Sharp program to check whether a number is Strong Number or not.

C# Sharp Code Editor:

Contribute your code and comments through Disqus.