Double Pointer Array

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8 Replies - 2844 Views - Last Post: 29 August 2010 - 04:48 AM Rate Topic: -----

#1 Guest_Avi1990*


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Double Pointer Array

Posted 28 August 2010 - 09:34 PM

i have declared following function:

void foo(char**,int s)
{

}


and i am not able to pass 2D array... why so?.it show error to pass argument char** not char[][].

my main function

int main(){

Char array[4][4]={ {‘a’,’a’,’a’,’a’},
{‘a’,’a’,’a’,’a’},
{‘a’,’a’,’a’,’a’},
{‘a’,’a’,’a’,’a’}
}
      foo(array,4);

}

This post has been edited by JackOfAllTrades: 29 August 2010 - 04:44 AM
Reason for edit:: Added code tags.


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#2 guahguahmonster  Icon User is offline

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Re: Double Pointer Array

Posted 28 August 2010 - 09:41 PM

Hello.

Please use code tags.

The answer to your question:
C FAQ Question 6.18
C FAQ Question 6.19

This post has been edited by guahguahmonster: 28 August 2010 - 09:41 PM

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#3 Guest_Avi1990*


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Re: Double Pointer Array

Posted 29 August 2010 - 01:11 AM

this is my program. it show error. tell me how to pass two dimensional array, Array2D to display function in below code. i can't change the display function heading. i have to pass array to display function through pointer to pointer. 

#include <iostream>
using namespace std;
void Display(char**);

int main()
{
    char Array2D[6][6]={
                {'#','#','#','#','#','#'},
                {'#','0','0','0','#','#'},
                {'0','0','#','0','#','#'},
                {'#','#','#','0','#','#'},
                {'#','#','#','0','0','0'},
                {'#','#','#','#','#','#'}
                };

    Display(Array2D);
    return 0;
}

void Display(char** arr)
{
}

This post has been edited by JackOfAllTrades: 29 August 2010 - 04:47 AM
Reason for edit:: Added code tags.

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#4 janotte  Icon User is offline

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Re: Double Pointer Array

Posted 29 August 2010 - 01:17 AM

Welcome to DIC!

Please edit your posting (see the "EDIT" button in lower right).
( a ) Delete all your code.
( b ) Get a fresh copy of the code with formatting in place from your editor / IDE.
( c ) Paste the formatted code between code tags like this :code:
( d ) Use the "Preview Post" button to check it's all good.
( e ) Use the "Submit Modified Post" button to finish the editing.

Please give us some more details of your problem.
( a ) Does your code compile?
( b ) Any errors or warnings? If there are then share them with us.
( c ) Is the program producing any output?
( d ) How is the actual output different to what you want / expect? Give details and, ideally, examples.
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#5 guahguahmonster  Icon User is offline

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Re: Double Pointer Array

Posted 29 August 2010 - 01:50 AM

Greetings.

Did you happen to post a duplicate thread ...? You realize I already answered your question in your previous thread? Copied for reference.

View Postguahguahmonster, on 28 August 2010 - 10:41 PM, said:

Hello.

Please use code tags.

The answer to your question:
C FAQ Question 6.18
C FAQ Question 6.19

This post has been edited by guahguahmonster: 29 August 2010 - 01:54 AM

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#6 Guest_Avi1990*


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Re: Double Pointer Array

Posted 29 August 2010 - 03:41 AM

This is my program. it show error. tell me how to pass two dimensional array, Array2D to display function in below code. i can't change the display function heading. i have to pass array to display function through pointer to pointer. i tried link sent to me before but that's not helping.

And i am getting this error.

main.cpp|79|error: cannot convert `char (*)[6]' to `char**' for argument `1' to `void Display(char**)'|


#include <iostream>
using namespace std;
void Display(char**);

int main()
{
    char Array2D[6][6]={
    {'#','#','#','#','#','#'},
    {'#','0','0','0','#','#'},
    {'0','0','#','0','#','#'},
    {'#','#','#','0','#','#'},
    {'#','#','#','0','0','0'},
    {'#','#','#','#','#','#'}
    };

    Display(Array2D);
    return 0;
}

void Display(char** arr)
{
}

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#7 baavgai  Icon User is offline

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Re: Double Pointer Array

Posted 29 August 2010 - 04:09 AM

I considered ignoring or locking this, since you've already posted it, twice.

The answer is that char var[][] is simply not the same as char **. If you wish to treat it as a 2D array, you must provide the second dimension in the call.

e.g. 
void Display(char arr[][6])


Yes, that's sloppy and not very modular, but so are 2D arrays. Another option is to make a struct or class to pass the data that contains the dimension information.

If you give any kind of good faith effort, I'd be happy to show you.
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#8 Guest_Avi1990*


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Re: Double Pointer Array

Posted 29 August 2010 - 04:20 AM

thanks its working.....if i need more help i will ask.

View Postbaavgai, on 29 August 2010 - 03:09 AM, said:

I considered ignoring or locking this, since you've already posted it, twice.

The answer is that char var[][] is simply not the same as char **. If you wish to treat it as a 2D array, you must provide the second dimension in the call.

e.g. 
void Display(char arr[][6])


Yes, that's sloppy and not very modular, but so are 2D arrays. Another option is to make a struct or class to pass the data that contains the dimension information.

If you give any kind of good faith effort, I'd be happy to show you.

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#9 JackOfAllTrades  Icon User is offline

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Re: Double Pointer Array

Posted 29 August 2010 - 04:48 AM

Merged multiple duplicates. Please do not create duplicate topics.
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