[erlang-questions] how do I convert a character to an integer (dict broke the integer I put into it)

Dominic Chambers <>
Sun Dec 16 12:29:21 CET 2007


Yes, thanks Matthias, that works! Clearly I do not understand the
difference between dict:store/3 and dict:append/3. Let me go and
educate myself!

On Dec 16, 2007 10:46 AM, Matthias Lang <> wrote:
> Dominic Chambers writes:
>
>  > I add some integers as values into a dict, but when I go to retrieve
>  > them they are now strings. After an hour of googling the only thing I
>  > can find online is that $c does what I want for character literals,
>  > but this doesn't seem to work for character variables. I need this
>  > because adding to the number I get out of the dict gives me a badarith
>  > error.
>
> You didn't provide any examples of what you mean. Here's an example
> which seems to contradict what you're saying:
>
>    1> A = dict:new(), B = dict:store(this_is_my_key, 65, A).                       {dict,1,
>          16,
>          16,
>          8,
>          80,
>          48,
>          {[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[]},
>          {{[],[],[],[],[],[],[],[],[],[[this_is_my_key|65]],[],[],[],[],[],[]}}}
>    2> C = dict:fetch(this_is_my_key, B).
>    65
>    3> C + 9.
>    74
>
> A stab in the dark: one explanation for "why would Dominic write the
> above" is that you have not understood the difference between
> dict:store/3 and dict:append/3? Remember, in Erlang a string is
> represented as a list of integers.
>
> Matt
>



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