how to parse this file?

I have a file as follows:

Code:

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cons: chromosome06 31329000 0 T Zero coverage
cons: chromosome06 31329001 0 T Zero coverage
cons: chromosome06 31329002 0 G Zero coverage
cons: chromosome06 31329003 0 G Zero coverage
cons: chromosome06 31329004 0 A Zero coverage
cons: chromosome06 31329005 0 C Zero coverage
cons: chromosome06 31329006 0 A Zero coverage
cons: chromosome06 31329007 0 C Zero coverage
..

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cons: chromosome06 31329000 0 T Zero coverage
I want to get the content whose color is blue,
but I don't know how to process it, I am a newbie who begin to learn c++
Can anyone help me?
I want to load into memory using two-dimension array:

Code:

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char **chr;
chr[6][31329001] = 0;

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Use a string tokenizer to get each string that is divided by a space. And for the first value (the chromosome 06), you just have to parse it yourself after you got it from the tokenizer. Just remember though that the outputs are strings (ie. pointer of chars) so you have to convert it to an integer before using it as array indices. Hope that helps.

PS: Last time I used STL string tokenizer, it was not working correctly (dunno now) so I suggest you use Boost C++'s tokenizer or you can make them yourself. :D

Quote:

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Originally Posted by g4j31a5

Use a string tokenizer to get each string that is divided by a space. And for the first value (the chromosome 06), you just have to parse it yourself after you got it from the tokenizer. Just remember though that the outputs are strings (ie. pointer of chars) so you have to convert it to an integer before using it as array indices. Hope that helps.

PS: Last time I used STL string tokenizer, it was not working correctly (dunno now) so I suggest you use Boost C++'s tokenizer or you can make them yourself. :D

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There is no standard STL string tokenizer. Your only option is to write one yourself(Using STL stuff if you prefer) or use someone else's.

Quote:

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Originally Posted by IceDane

There is no standard STL string tokenizer. Your only option is to write one yourself(Using STL stuff if you prefer) or use someone else's.

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Doesn't strtok() qualify as a standard STL string tokenizer?

Quote:

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Originally Posted by syzygy

Doesn't strtok() qualify as a standard STL string tokenizer?

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No. It's part of the C standard, not the STL, and it doesn't work on STL strings.

Quote:

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Originally Posted by syzygy

Doesn't strtok() qualify as a standard STL string tokenizer?

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No, strtok() was never part of the STL.

Anyway, to stick to the standard library, tokenisation can be performed by using getline() to read each line, then initialise a stringstream with the line and read formatted input using an overloaded operator>>. As g4j31a5 indicated, a little more work would be needed to extract the part that is at the end of "chromosome".

Quote:

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Originally Posted by IceDane

There is no standard STL string tokenizer. Your only option is to write one yourself(Using STL stuff if you prefer) or use someone else's.

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Oh yeah, my bad. I was talking about strtok(). :P

I write a test code using strtok,but it can't work,
why?

Code:

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      //#include "syslib.h"
      #include <string.h>
      #include <stdio.h>
      using namespace std;
      main()
      {
        char *s="Golden Global View";
        char *d=" ";
        char *p;
       
        //clrscr();
       
        p=strtok(s," ");
       
        while(p)
        {
          printf("%s\n",s);
          strtok(NULL,d);
        }
       
        //getchar();
        return 0;
      }

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strtok is destructive, and as such can't be called on nonmodifiable/const data, which s is (it points to a string literal, which is not memory you own or can change).

Quote:

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Originally Posted by tabstop

strtok is destructive, and as such can't be called on nonmodifiable/const data, which s is (it points to a string literal, which is not memory you own or can change).

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I see ! thans