Struct Char Array Problems

This is a discussion on Struct Char Array Problems within the C Programming forums, part of the General Programming Boards category; I am trying to put a char array into a struct but everything I have tried has not worked. Code: ...

  1. #1
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    Question Struct Char Array Problems

    I am trying to put a char array into a struct but everything I have tried has not worked.

    Code:
    typedef struct{
    int Grid_X;
    int Grid_Y;
    char Room_Name[30];
    int North;
    int South;
    int East;
    int West;
    int Warp;
    int Warp_X;
    int Warp_Y;
    int Chest;
    }Room;
    
    Room RG; //in main
    
    char Name[30] = (*RG).Room_Name; //line 71
    //In another function
    
    void set_room_start(Room *RG){
    (*RG).Grid_X = 0;
    (*RG).Grid_Y = 0;
    (*RG).Room_Name[30] = "Start Room"; //line 14
    (*RG).North = 1;
    (*RG).South = 1;
    (*RG).East = 1;
    (*RG).West = 1;
    (*RG).Warp = 1;
    (*RG).Warp_X = 5;
    (*RG).Warp_Y = 0;
    (*RG).Chest = 1;
    }

    That gives me warnings:
    "14 E:\Code\Source Code\Game Commands.c [Warning] assignment makes integer from pointer without a cast"

    "71 E:\Code\Source Code\Game Commands.c array initialized from non-constant array expression"

    Could some one point out the mistake I am making in my struct code? Thanx in advance
    RMDan

    Edit:
    For those who may be picky, Yes I did pas the address of RG to my functions.
    Last edited by RMDan; 06-18-2009 at 01:52 PM.

  2. #2
    Banned ಠ_ಠ's Avatar
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    arrays don't work that way
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  3. #3
    Registered User hk_mp5kpdw's Avatar
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    Looks like maybe you need to use the strcpy function.
    "Owners of dogs will have noticed that, if you provide them with food and water and shelter and affection, they will think you are god. Whereas owners of cats are compelled to realize that, if you provide them with food and water and shelter and affection, they draw the conclusion that they are gods."
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  4. #4
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    Code:
    (*RG).Grid_X = 0;
    It is quite a bit easier to just write:
    Code:
    RG->Grid_X = 0;
    And as others have stated, read up on how to use strcpy().

  5. #5
    spurious conceit MK27's Avatar
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    #1 tip about the number one:

    Get one of something to actually work before you code ten of them the same, completely wrongly.
    C programming resources:
    GNU C Function and Macro Index -- glibc reference manual
    The C Book -- nice online learner guide
    Current ISO draft standard
    CCAN -- new CPAN like open source library repository
    3 (different) GNU debugger tutorials: #1 -- #2 -- #3
    cpwiki -- our wiki on sourceforge

  6. #6
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    I forgot about strcpy. That makes a huge difference.

    hk_mp5kpdw:
    Thanks that got rid of the errors

    bithub:
    Thanks for the tip. Going to change that in my engine later.

    MK27:
    My Struct is perfectly fine except for one line. I got the ints to work for me then I attempted to put a char in the Struct. So basically I did what you said so don't post criticism.

    RMDan
    Last edited by RMDan; 06-19-2009 at 12:21 PM.

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