Design and develop a single page ASP.NET web application that converts a given number

Question

I keep getting the following error: Cannot implicitly convert type 'int' to 'string'. I'm using C# for an ASP.web application

public string binTodec(int num)
        {
            int binaryNumber = int.Parse(Console.ReadLine());
            int decimalValue = 0; 
            int base1 = 1;


            while (binaryNumber > 0)
            {
                int reminder = binaryNumber % 10;
                binaryNumber = binaryNumber / 10;
                decimalValue += reminder * base1;
                base1 = base1 * 2;
            }
            Console.Write($"Decimal Value : {decimalValue} ");
            Console.ReadKey();
            return decimalValue;


        }

Any idea what my issue is??

Answer 1

The following is an algorithm that should work for your purposes:

public string binToDec(string bin)
{
    int result = 0;
    int exp = 0;
    for (int i = bin.Length - 1; i > -1; i--, exp++)
    {
        double baseVal = 2 * double.Parse((bin.Substring(i, 1)));
        if (baseVal == 0) continue;
        double expVal = (double)(exp);
        result += (int)(Math.Pow(baseVal, expVal));
    }
    return result.ToString();
}