How could I convert a number form binary to an arbitrary base like 19 or 23?

On 6/1/15 3:43 PM, Hugo wrote:
> How could I convert a number form binary to an arbitrary base like 19 or
> 23?

import std.conv;

to!(string)(100, 19); // "55"

-Steve

On Monday, 1 June 2015 at 19:53:50 UTC, Steven Schveighoffer wrote:
> On 6/1/15 3:43 PM, Hugo wrote:
>> How could I convert a number form binary to an arbitrary base like 19 or
>> 23?
>
> import std.conv;
>
> to!(string)(100, 19); // "55"

Thanks! Is there a way to specify a source base different than 10?

And by the way, this method does not seem to work for bases higher than 36, how could one achieve for example a conversion to a base-60?

On 6/1/15 7:16 PM, Hugo wrote:
> On Monday, 1 June 2015 at 19:53:50 UTC, Steven Schveighoffer wrote:
>> On 6/1/15 3:43 PM, Hugo wrote:
>>> How could I convert a number form binary to an arbitrary base like 19 or
>>> 23?
>>
>> import std.conv;
>>
>> to!(string)(100, 19); // "55"
>
> Thanks! Is there a way to specify a source base different than 10?

A "source base"? the source base is always binary :)

If you want to go between base string representation, there is parse for going from string to binary.

> And by the way, this method does not seem to work for bases higher than
> 36, how could one achieve for example a conversion to a base-60?

35 in base-36 is Z. What is 36 in base-37? At some point you run out of alphabet.

-Steve

On Tuesday, 2 June 2015 at 00:00:43 UTC, Steven Schveighoffer wrote:
> On 6/1/15 7:16 PM, Hugo wrote:
>> Thanks! Is there a way to specify a source base different than 10?
>
> A "source base"? the source base is always binary :)
>
> If you want to go between base string representation, there is parse for going from string to binary.

What I meant was for example being able to pass from console as an argument the number to convert lets say in hexadecimal, octal or binary representation.

I will check parse though, thanks.

>> And by the way, this method does not seem to work for bases higher than
>> 36, how could one achieve for example a conversion to a base-60?
>
> 35 in base-36 is Z. What is 36 in base-37? At some point you run out of alphabet.

Well.. that depends on what you accept as valid characters, doesn't it?
Base-64 is a good example.

On 6/1/15 8:36 PM, Hugo wrote:
> On Tuesday, 2 June 2015 at 00:00:43 UTC, Steven Schveighoffer wrote:
>> On 6/1/15 7:16 PM, Hugo wrote:
>>> Thanks! Is there a way to specify a source base different than 10?
>>
>> A "source base"? the source base is always binary :)
>>
>> If you want to go between base string representation, there is parse
>> for going from string to binary.
>
> What I meant was for example being able to pass from console as an
> argument the number to convert lets say in hexadecimal, octal or binary
> representation.
>
> I will check parse though, thanks.

Yes, use std.conv.parse:

auto binRepresentation = parse!long("1a2b", 16); // read hex

>
>>> And by the way, this method does not seem to work for bases higher than
>>> 36, how could one achieve for example a conversion to a base-60?
>>
>> 35 in base-36 is Z. What is 36 in base-37? At some point you run out
>> of alphabet.
>
> Well.. that depends on what you accept as valid characters, doesn't it?
> Base-64 is a good example.

This means 'A' and 'a' have 2 different values.

I don't think a general function such as to with radix is good for this. You can probably do better with a custom function, I'm not sure if there's any base-64 libraries out there.

-Steve

On Mon, 01 Jun 2015 21:43:56 -0400, Steven Schveighoffer wrote:

> I don't think a general function such as to with radix is good for this. You can probably do better with a custom function, I'm not sure if there's any base-64 libraries out there.

std.base64? ;-)