pointerz

This is a discussion on pointerz within the C Programming forums, part of the General Programming Boards category; i just need to know what a pointer really does... can you correct me if im wrong... so if i ...

  1. #1
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    pointerz

    i just need to know what a pointer really does...
    can you correct me if im wrong...

    so if i was to write something like..

    Code:
    struct char *house[] = {
                                house1
                                 house2
                                 house3
                                         }
    does this means that if i was to do

    Code:
      if (char = p_house)
           house3 = blah;
    will that work if not then can you explain to me like if a 3 year old kid on how to understand .... thanx

  2. #2
    Registered User Nutshell's Avatar
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    A pointer points to a memory address, unlike variables which contain the actualy value.

  3. #3
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    Perhaps this explains a little bit on pointers and structures.

    Code:
    /* Definition of a structure */
    struct datastruct
    {
        int data1;
        int data2;
    };
    
    /* Pointer to structure */
    typedef struct datastruct *pdatastruct;
    
    /* Instance of structure */
    struct datastruct mydatastruct;
    
    /* Pointer to instance of structure */
    pdatastruct *pmydatastruct;
    
    /* Let pointer point to mydatastruct */
    pmydatastruct = &mydatastruct;
    
    /* Access to members of structure */
    mydatastruct.data1 = 1;
    mydatastruct.data2 = 2;
    
    /* Acces members using pointer */
    pmydatastruct->data1 = 3;
    pmydatastruct->data2 = 4;

  4. #4
    napKINfolk.com napkin111's Avatar
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    Everyone says pointers are essential....but I can't find a good use for them. Maybe thats cause I'm still programming text based RPGs

  5. #5
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    >but I can't find a good use for them.

    Just take a look at datastructures like trees, linked lists, graphs etc.

    Read some tutorials on C and you'll many applications of pointers.

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