Probllem I'm Solving

This is a discussion on Probllem I'm Solving within the C Programming forums, part of the General Programming Boards category; Hi there; I need a help with a problem I am trying to code around. I need to take in ...

  1. #1
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    Probllem I'm Solving

    Hi there;

    I need a help with a problem I am trying to code around.

    I need to take in a line - in the form "xxx $y, $y, $y". The line is always in this form. xxx can be any character, and the following $y's are $anynumber - seperated by commas.

    The tokens may be seperated by no spaces, a single space, tabs, multiple spaces or a combination of both. There is always at least one spaxe seperating "xxx" from the first "$y", however.

    I need to parse these into four arrays, but not sure where to start with the space-handling.

    Any ideas?

  2. #2
    and the hat of wrongness Salem's Avatar
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    The ever flexible sscanf....
    Code:
    $ cat foo.c && gcc foo.c && ./a.out
    #include <stdio.h>
    int main ( ) {
      char test[] = "abc $12, $34, $567";
      char string[10];
      int  x, y, z;
    
      if ( sscanf( test, "%s $%d, $%d, $%d",
                   string, &x, &y, &z ) == 4 ) {
        printf( "Conversion OK\n" );
        printf( "String=%s, numbers=%d,%d,%d\n", string, x, y, z );
      }
      return 0;
    }
    
    
    Conversion OK
    String=abc, numbers=12,34,567
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  3. #3
    Fountain of knowledge.
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    I think you can use scanf because I think it sort of
    ignores white space (probably)



    scanf "%s $%d, $%d, $%d", strval, &yy, &xx, &zz);


    Some of the characters may be special so might need a \ before
    then such as

    %s \$%d, \$%d, \$%d",


    Less likely is
    "%s \$%d\, \$%d\, \$%d"

  4. #4
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    Quote Originally Posted by Salem
    The ever flexible sscanf....
    Code:
    $ cat foo.c && gcc foo.c && ./a.out
    #include <stdio.h>
    int main ( ) {
      char test[] = "abc $12, $34, $567";
      char string[10];
      int  x, y, z;
    
      if ( sscanf( test, "%s $%d, $%d, $%d",
                   string, &x, &y, &z ) == 4 ) {
        printf( "Conversion OK\n" );
        printf( "String=%s, numbers=%d,%d,%d\n", string, x, y, z );
      }
      return 0;
    }
    
    
    Conversion OK
    String=abc, numbers=12,34,567
    How do I ignore the whitespaces, say if they were deliminated by tabs instead?

  5. #5
    and the hat of wrongness Salem's Avatar
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    Tabs are whitespace as far as sscanf is concerned.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

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