initialize a rational from a decimal string

[edA-qa mort-ora-y]

On 12/03/13 18:57, Torbjorn Granlund wrote:
>   3.89e100 => 389/1
> Hm, are you sure about that last calculation?  :-)

Oops, that should be 3.89e2

> We don't provide a function for this.  Perhaps we should.

It'd be really convenient, but I have one now. ;)
I'll just through up a short blog article in case somebody else is
looking for this.

> Instead of repeatedly multiplying by 10, I'd suggest that you multiply
> by a suitable power of 10, which you'll need to figure out first.
> It does not matter too much if the power is minimal, as long as it is
> not very much too large.

Yes, from another poster I use strlen to figure out the exponent of 10.
My code will also have a cut-off point for the exponent, so beyond a few
hundred I'll switch to using a high-precision mpf instead.


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