Convert large binary string to decimal string

Question

I've got a large text, containing a number as a binary value. e.g '123' would be '001100010011001000110011'. EDIT: should be 1111011

Now I want to convert it to the decimal system, but the number is too large for Int64.

So, what I want: Convert a large binary string to decimal string.

My calculator says that 1100010011001000110011₂ equals 3224115₁₀, not 123₁₀. 3224115₁₀ is not too large for Int64. — dtb
– dtb, Commented Jan 7, 2012 at 23:50
Have you googled? I found this: cboard.cprogramming.com/csharp-programming/… — fury
– fury, Commented Jan 7, 2012 at 23:52
How did you get from 123 decimal to 001100010011001000110011 binary? — Mike W
– Mike W, Commented Jan 7, 2012 at 23:52
No homework, and i google for that 123 on ascii to bin. Oh, and the numbers represents filecontents. EDIT: 123 should be 1111011 — Lennart
– Lennart, Commented Jan 8, 2012 at 0:01

Nuffin · Accepted Answer · 2012-01-08 00:38:18Z

16

This'll do the trick:

public string BinToDec(string value)
{
    // BigInteger can be found in the System.Numerics dll
    BigInteger res = 0;

    // I'm totally skipping error handling here
    foreach(char c in value)
    {
        res <<= 1;
        res += c == '1' ? 1 : 0;
    }

    return res.ToString();
}

edited Jan 8, 2012 at 0:38

answered Jan 7, 2012 at 23:56

Nuffin

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4 Comments

fury Over a year ago

OP said it's too big for even int64, so he wants a decimal string.

Nuffin Over a year ago

Yeah, changed it to match his needs.

Mike W Over a year ago

BigInteger is in System.Numerics which as not referenced by default.

Nuffin Over a year ago

@MikeW: That's why I inserted the location in the sample while you were typing your comment ;)

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