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Re: [Structure of Array] pointer arithmetic in structures

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On 19/12/2016 18:53, Dexterr wrote:
> On Monday, December 19, 2016 at 1:23:21 AM UTC+1, Ben Bacarisse wrote:
>> Dexterr <dejangru@gmail.com> writes:
>>
>>> On Sunday, December 18, 2016 at 10:26:30 PM UTC+1, Ben Bacarisse wrote:
>>>> Dexterr <dejangru@gmail.com> writes:
>>>>
>>>>> On Sunday, December 18, 2016 at 9:07:41 PM UTC+1, Ben Bacarisse wrote:
>>>>>> Dexterr <dejangru@gmail.com> writes:
>>>>>>
>>>>>>>> If the input will always be in the form A/B or (A/B), where A and B are
>>>>>>>> integers, then that makes things easier. Read as two integers
>>>>>>>> (discarding "(", "/" and ")"), and store as two integers. Optionally
>>>>>>>> divide them (as (double)A/B otherwise you'll get 0) to calculate with.
>>>>>>>>
>>>>>>> YES. Thats what I intend to do!
>>>>>>>
>>>>>>> I am looking for elegant solution right now.
>>>>>>>
>>>>>>>   const char str1[2] = "(";
>>>>>>>   const char str2[2] = ")";
>>>>>>>
>>>>>>>   char *token_01 = "";
>>>>>>>   char *token_02 = "";
>>>>>>>
>>>>>>>   token_01 = strtok(ptr_parts[2].value, str1);
>>>>>>>   token_02 = strtok(ptr_parts[2].value, str2);
>>>>>>
>>>>>> Just some more food for thought:
>>>>>>
>>>>>> #include <stdio.h>
>>>>>>
>>>>>> int main(void)
>>>>>> {
>>>>>>      char line[100];
>>>>>>      while (fgets(line, sizeof line, stdin)) {
>>>>>>           int num, den;
>>>>>>           if (sscanf(line, " (%d/%d)", &num, &den) == 2)
>>>>>>                printf("%g\n", (double)num/den);
>>>>>>           else puts("Input line should have the form \"(A/B)\"");
>>>>>>      }
>>>>>> }
>>>>>
>>>>> Thanks Mr Ben. ;)
>>>>> Yes, this is very nice example but when user put from the terminal
>>>>> values such as (47/100).
>>>>> But, in my case it is about input text file which consist values such
>>>>> (A/B) and I must use this and convert from string into float form, to
>>>>> make some calculations and then result from float form turn again into
>>>>> a form (A/B).
>>>>
>>>> You are seeing distinctions that don't exit.  I read a line from a
>>>> stream just as you do and I extract some numbers from the resulting
>>>> string.  This example is directly applicable to your situation.
>>>>
>>>> But there is a problem...  If you have been following the advice to do
>>>> it one way, it can be unhelpful to be shown other ways.  If you choose
>>>> not to use sscanf, when you've finished your exercise, I'll post the
>>>> full version of how I would have done it so you can compare (though you
>>>> may need to remind me).
>>>
>>> Mr Ben, did you read the specifications what I need to do in my example ?
>>> The algorithm for calculations is extrem complicated.
>>
>> No, I must have missed that.  I saw only that you must do some
>> computations but I did not what they were.  But I don't think the nature
>> of the computations changes much since the code you posted dealt only
>> with interpreting the input.  My suggestion was specifically about that.
>>
>> But, as I said, if using sscanf is not a helpful suggestion, then just
>> forget I said anything.
>>
>>> I am very
>>> desperate because I am
>>> doing this for 2 weeks completely alone. My collegue work nothing. We
>>> are in 2 students group.
>>> I have to do it till Tuesday and I am in the position to cry. I fill
>>> so sad. If I fail I must wait one year but it is not to wait, I realy
>>> need to learn C and understand. So many hours invest and after all it
>>> will be nothing.
>>
>> You should get partial credit for whatever parts you have managed to
>> complete, and there should be a process for you to register the fact
>> that your team mate as not contributed anything.
>>
>> --
>> Ben.
>
> Thanks Mr Ben.
>
> I like your solution, but it not work.
>
> ---
>
> #include <stdio.h>
> #include <string.h>
> #include <stdlib.h>
>
> #define FILENAME "netlist.txt"
> #define NUM_FIELDS 4
>
> typedef struct
> {
>   char *component;
>   char *a_node;
>   char *b_node;
>   char *value;
> }Components;
>
> void readComponentFile(void);
>
>
> char line[130] = "";
>
> int main(void)
> {
>   readComponentFile();
>   return 0;
> }
>
> void readComponentFile()
> {
>   FILE *fp = fopen(FILENAME, "r");
>
>   char line[100];
>
>   if(fp != NULL)
>   {
>     while (fgets(line, sizeof line, stdin))

Change stdin to fp if you're going to read from the file.

Then I found it worked if the file looks like this:

(10/3)
(48/100)
(1/1000000)


-- 
Bartc

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Thread

[Structure of Array] pointer arithmetic in structures Dexterr <dejangru@gmail.com> - 2016-12-18 07:51 -0800
  Re: [Structure of Array] pointer arithmetic in structures fir <profesor.fir@gmail.com> - 2016-12-18 08:15 -0800
    Re: [Structure of Array] pointer arithmetic in structures Dexterr <dejangru@gmail.com> - 2016-12-18 09:31 -0800
  Re: [Structure of Array] pointer arithmetic in structures BartC <bc@freeuk.com> - 2016-12-18 16:27 +0000
    Re: [Structure of Array] pointer arithmetic in structures Dexterr <dejangru@gmail.com> - 2016-12-18 09:43 -0800
      Re: [Structure of Array] pointer arithmetic in structures BartC <bc@freeuk.com> - 2016-12-18 18:13 +0000
        Re: [Structure of Array] pointer arithmetic in structures Dexterr <dejangru@gmail.com> - 2016-12-18 10:31 -0800
      Re: [Structure of Array] pointer arithmetic in structures Barry Schwarz <schwarzb@dqel.com> - 2016-12-18 10:39 -0800
  Re: [Structure of Array] pointer arithmetic in structures Dexterr <dejangru@gmail.com> - 2016-12-18 10:02 -0800
    Re: [Structure of Array] pointer arithmetic in structures Barry Schwarz <schwarzb@dqel.com> - 2016-12-18 10:20 -0800
      Re: [Structure of Array] pointer arithmetic in structures Dexterr <dejangru@gmail.com> - 2016-12-18 10:40 -0800
        Re: [Structure of Array] pointer arithmetic in structures Barry Schwarz <schwarzb@dqel.com> - 2016-12-18 10:54 -0800
          Re: [Structure of Array] pointer arithmetic in structures Dexterr <dejangru@gmail.com> - 2016-12-18 11:10 -0800
        Re: [Structure of Array] pointer arithmetic in structures BartC <bc@freeuk.com> - 2016-12-18 18:54 +0000
          Re: [Structure of Array] pointer arithmetic in structures Dexterr <dejangru@gmail.com> - 2016-12-18 11:05 -0800
          Re: [Structure of Array] pointer arithmetic in structures Dexterr <dejangru@gmail.com> - 2016-12-18 11:22 -0800
            Re: [Structure of Array] pointer arithmetic in structures BartC <bc@freeuk.com> - 2016-12-18 19:38 +0000
              Re: [Structure of Array] pointer arithmetic in structures Dexterr <dejangru@gmail.com> - 2016-12-18 11:45 -0800
                Re: [Structure of Array] pointer arithmetic in structures Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-12-18 20:07 +0000
                Re: [Structure of Array] pointer arithmetic in structures Dexterr <dejangru@gmail.com> - 2016-12-18 12:35 -0800
                Re: [Structure of Array] pointer arithmetic in structures Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-12-18 21:26 +0000
                Re: [Structure of Array] pointer arithmetic in structures Dexterr <dejangru@gmail.com> - 2016-12-18 13:47 -0800
                Re: [Structure of Array] pointer arithmetic in structures Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-12-19 00:23 +0000
                Re: [Structure of Array] pointer arithmetic in structures Dexterr <dejangru@gmail.com> - 2016-12-19 10:53 -0800
                Re: [Structure of Array] pointer arithmetic in structures BartC <bc@freeuk.com> - 2016-12-19 19:11 +0000
                Re: [Structure of Array] pointer arithmetic in structures Dexterr <dejangru@gmail.com> - 2016-12-19 11:20 -0800
                Re: [Structure of Array] pointer arithmetic in structures BartC <bc@freeuk.com> - 2016-12-19 19:31 +0000
                Re: [Structure of Array] pointer arithmetic in structures Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-12-19 20:06 +0000
                Re: [Structure of Array] pointer arithmetic in structures Dexterr <dejangru@gmail.com> - 2016-12-19 11:27 -0800
                Re: [Structure of Array] pointer arithmetic in structures BartC <bc@freeuk.com> - 2016-12-19 19:40 +0000
                Re: [Structure of Array] pointer arithmetic in structures Dexterr <dejangru@gmail.com> - 2016-12-19 12:09 -0800
                Re: [Structure of Array] pointer arithmetic in structures Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-12-19 20:15 +0000
                Re: [Structure of Array] pointer arithmetic in structures "Peter \"Shaggy\" Haywood" <phaywood@alphalink.com.au> - 2016-12-24 17:12 +1100
                Re: [Structure of Array] pointer arithmetic in structures Barry Schwarz <schwarzb@dqel.com> - 2016-12-19 16:15 -0800

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