Converting Between Binary and Decimal in C#

The following two source code listings showhow to write a crude but effective console mode application forconverting a number, either from binary to decimal, or from decimal tobinary. Note: you pass in the decimal number or the binary string as aparameter when typing the program's name at a command prompt.

From Decimal to Binary…

using System;

class Program{

static void Main(string[] args){

try{

int i = (int)Convert.ToInt64(args[0]);
Console.WriteLine("n{0} converted to Binary is {1}n",i,ToBinary(i));

}catch(Exception e){

Console.WriteLine("n{0}n",e.Message);

}

}//end Main

public static string ToBinary(Int64 Decimal)
{
// Declare a few variables we're going to need
Int64 BinaryHolder;
char[] BinaryArray;
string BinaryResult = "";

while (Decimal > 0)
{
BinaryHolder = Decimal % 2;
BinaryResult += BinaryHolder;
Decimal = Decimal / 2;
}

// The algoritm gives us the binary number in reverse order (mirrored)
// We store it in an array so that we can reverse it back to normal
BinaryArray = BinaryResult.ToCharArray();
Array.Reverse(BinaryArray);
BinaryResult = new string(BinaryArray);

return BinaryResult;
}

}//end class Program

——————————————————————————–

From Binary to Decimal…

using System;

class Program{

static void Main(string[] args){

try{

int i = ToDecimal(args[0]);
Console.WriteLine("n{0} converted to Decimal is {1}",args[0],i);

}catch(Exception e){

Console.WriteLine("n{0}n",e.Message);

}

}//end Main

public static int ToDecimal(string bin)
{
long l = Convert.ToInt64(bin,2);
int i = (int)l;
return i;
}

}//end class Program

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