# C# Program to Convert Binary to Decimal with Examples

Introduction:

In this article, we’ll explore how to write a C# Program to Convert Binary to Decimal.

### Section 1: Basics of Binary and Decimal Systems

#### 1.1 Binary System

Before diving into C# code, let’s grasp the basics. The binary system uses only two digits, 0 and 1. Each digit is called a bit, and the position of each bit represents a power of 2.

#### 1.2 Decimal System

The decimal system uses base 10 and includes digits from 0 to 9. Each position in a decimal number represents a power of 10.

### Section 2: C# Program to Convert Binary to Decimal

Now, let’s translate the theory into C# code.

#### 2.1 Using Convert.ToInt32() Method

Following is the C# Program to Convert Binary to Decimal Using `Convert.ToInt32`() method.

``````using System;

class BinaryToDecimalConverter
{
static void Main()
{
string binaryNumber = "101011";
int decimalNumber = Convert.ToInt32(binaryNumber, 2);

Console.WriteLine(\$"Binary: {binaryNumber}\nDecimal: {decimalNumber}");
}
}
``````

Output:

``````Binary: 101011
Decimal: 43``````

Code Explanation:

• We use `Convert.ToInt32()` method to convert the binary string to an integer.
• The second parameter, `2`, indicates that the input is in base 2 (binary).

#### 2.2 Manual Conversion Using Loops

``````using System;

class BinaryToDecimalConverter
{
static void Main()
{
string binaryNumber = "101011";
int decimalNumber = 0;

for (int i = 0; i < binaryNumber.Length; i++)
{
int bit = int.Parse(binaryNumber[i].ToString());
int power = binaryNumber.Length - 1 - i;
decimalNumber += bit * (int)Math.Pow(2, power);
}

Console.WriteLine(\$"Binary: {binaryNumber}\nDecimal: {decimalNumber}");
}
}
``````

Output:

``````Binary: 101011
Decimal: 43``````

Code Explanation:

• In the above code, the `binaryNumber` variable holds the binary input as a string.
• The `decimalNumber` variable is initialized to store the result of the conversion.
• We are using `for` loop to iterate through each bit of the binary number from left to right.
• Inside the loop, `bit` is the current binary digit (0 or 1).
• The `power` variable calculates the position value of the current bit.
• The `decimalNumber` is updated by adding the contribution of the current bit using the formula `bit Ã—2 power`.
• Finally, the original binary number and the resulting decimal number are printed to the console.

#### 2.3 Performs binary-to-decimal conversion

The following C# program takes user input and performs binary-to-decimal conversion.

``````using System;

class BinaryToDecimalConverter
{
static void Main()
{
// Infinite loop to keep the program running
while (true)
{
// Prompt user for input
Console.Write("Enter a binary number (or 'exit' to end): ");

// Check if the user wants to exit
if (userInput.ToLower() == "exit")
{
break; // Exit the loop if the user enters 'exit'
}

// Perform binary to decimal conversion
try
{
int decimalNumber = Convert.ToInt32(userInput, 2);
Console.WriteLine(\$"Binary: {userInput}\nDecimal: {decimalNumber}");
}
catch (FormatException)
{
Console.WriteLine("Invalid binary input. Please enter a valid binary number.");
}
catch (OverflowException)
{
Console.WriteLine("The entered binary number is too large to be represented as an integer.");
}

// Provide some space before the next iteration
Console.WriteLine();
}

// Inform the user that the program is exiting
Console.WriteLine("Program exiting. Thank you for using the Binary to Decimal Converter!");
}
}
``````

Output:

``````Enter a binary number (or 'exit' to end): 111111
Binary: 111111
Decimal: 63
Enter a binary number (or 'exit' to end): 101010
Binary: 101010
Decimal: 42

Enter a binary number (or 'exit' to end): exit
Program exiting. Thank you for using the Binary to Decimal Converter!``````

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