Simple Initialization Problem

This is a discussion on Simple Initialization Problem within the C++ Programming forums, part of the General Programming Boards category; I'm a noob and i'm just coding a small program to test what i know but i've hit a problem ...

  1. #1
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    Question Simple Initialization Problem

    I'm a noob and i'm just coding a small program to test what i know but i've hit a problem with this piece of code:

    Code:
    char grid[3][3];
     grid[1][1]=" ";
     grid[1][2]=" ";
     grid[1][3]=" ";
     grid[2][1]=" ";
     grid[2][2]=" ";
     grid[2][3]=" ";
     grid[3][1]=" ";
     grid[3][2]=" ";
     grid[3][3]=" ";
    i know my problem is that i'm initialising this array wrong however i don't know how to fix it to do what i want. Basically each part of this array is to store either a static space ,x or o. Someone i talked to this said i should initialize this as a string rather than char but i dont know how to do this.

    Can someone help me?

  2. #2
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    First of all, arrays are 0 based. So if you make an array of size 3, the elements go from 0 to 2. Next, characters use single quotes; double quotes are for strings (char arrays).

    Then you can initialize your array all at once:
    Code:
    char grid[3][3] = {
      { ' ', ' ', ' ' },
      { ' ', ' ', ' ' },
      { ' ', ' ', ' ' }
    };

  3. #3
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    sorry i obviously did a really bad job of explaining myself, i actually want the variables to store strings (its just got char infront of it atm because thats what it was like when i stopped) thats why i need to change it from initialising a char to initialising a string, however i do not know the keyword that is needed to initialize strings and i put in the code incase what i want to do is impossible and i have to try something else.

  4. #4
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    Well since this is C++ and you are new to it, I suggest you using the std::string class. This is by far the easiest way for new C++ programmers:
    Code:
    #include <string>
    using namespace std;
    
    string grid[3][3] = {
      { " ", " ", " " },
      { " ", " ", " " },
      { " ", " ", " " }
    };
    Or if you're feeling adventurous and want to do it the C way:
    Code:
    char *grid[3][3] = {
      { " ", " ", " " },
      { " ", " ", " " },
      { " ", " ", " " }
    };
    Watch out there because you need to reallocate strings when you want to put something in it and delete after. Or if you don't want to do that, you can risk buffer overflows and use fixed-length strings, where 10 is the max size of each string including the null character (so 9 real characters total). You can change that number, of course:
    Code:
    char grid[3][3][10] = {
      { " ", " ", " " },
      { " ", " ", " " },
      { " ", " ", " " }
    };
    Again, note that arrays are zero-based. The first element is not at one, its at zero. So these are the bounds: grid[0..2][0..2]

  5. #5
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    I'm having a bit of trouble trying to get a string to store in an array ... heres what I have ... I tried following what he said above but I just got confused...

    Code:
    #include <string.h>
    
    using namespace std;
    
            char iname[8];
    
    	iname[0]="Plain Egg";
    	iname[1]="Bacon and Egg";
    	iname[2]="Muffin";
    	iname[3]="French Toast";
    	iname[4]="Fruit Basket";
    	iname[5]="Cereal";
    	iname[6]="Coffee";
    	iname[7]="Tea";

  6. #6
    Registered User major_small's Avatar
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    you're forgetting the minor dimension
    Code:
            char iname[8][15];
    
    	iname[0]="Plain Egg";
    	iname[1]="Bacon and Egg";
    	iname[2]="Muffin";
    	iname[3]="French Toast";
    	iname[4]="Fruit Basket";
    	iname[5]="Cereal";
    	iname[6]="Coffee";
    	iname[7]="Tea";
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  7. #7
    wierd guy bart's Avatar
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    Code:
    #include <string.h>
    
    using namespace std;
    
            string iname[8];
    
    	iname[0]="Plain Egg";
    	iname[1]="Bacon and Egg";
    	iname[2]="Muffin";
    	iname[3]="French Toast";
    	iname[4]="Fruit Basket";
    	iname[5]="Cereal";
    	iname[6]="Coffee";
    	iname[7]="Tea";
    Whats the point of including the string library if your not going to use it

  8. #8
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    >#include <string.h>
    #include <string>
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