CODEWITHSUNDEEP
c#
Денислав Ангелов
Денислав Ангелов

Reputation: 277

How can I convert from base 5 to base 10?

How can I convert the number 1234 to its base 10, 194 using code ?

string toBase10 = Convert.ToString(1234, 10);
Console.WriteLine(toBase10);

Upvotes: 2

Views: 1263

Answers (3)

w.b
w.b

Reputation: 11228

Another LINQ solution:

static int ConvertFromBase(int num, int @base)
{
    return num.ToString().Reverse()
              .Select((c, index) => (int)Char.GetNumericValue(c) * (int)Math.Pow(@base, index))
              .Sum();
}

Console.WriteLine(ConvertFromBase(1234, 5));  // 194

Upvotes: 0

NoName
NoName

Reputation: 8025

The simple way, use Linq:

static int ConvertFromBase5(string number)
{
    return number.Select(digit => (int)digit - 48).Aggregate(0, (x, y) => x * 5 + y);
}

Use:

Console.Write(ConvertFromBase5("1234"));

Upvotes: 2

Matthew Watson
Matthew Watson

Reputation: 109537

How about this?

public static long FromBase(long value, int @base)
{
    string number = value.ToString();
    long n = 1;
    long r = 0;

    for (int i = number.Length - 1; i >= 0; --i)
    {
        r += n*(number[i] - '0');
        n *= @base;
    }

    return r;
}

I made it long to handle bigger values. You could make it int if you wanted.

You could use it like this:

Console.WriteLine(FromBase(1234, 5)); // Prints "194"

Or if you wanted a string, just use ToString() on it.

var asString = FromBase(1234, 5).ToString();

It won't handle bases above 10 - but you can't hold numbers above base 10 in an int or long anyway - In fact, it's odd to do that for any base other than 10. Usually you'd use a string to avoid accidentally using those numbers as if they were base 10.

Upvotes: 1

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