Multidimensional array in function prototype

Question

I have a code like this:

class oBT{
    public: void clean(int**);
            void write(int**);
            bool check(int**);
            void backtrack(int**,int);
};

void oBT::clean(int R[8][8])
{ for(int i=1; i<=8; i++) for(int j=1; j<=8; j++) R[i][j]=0; }

void oBT::write(int R[8])
{
    for(int i=1; i<=8; i++)
    {
        for(int j=1; j<=8; j++)
            std::cout<<R[i]<<' ';
        std::cout<<'\n';
    }
    std::cout<<'\n';
}

bool oBT::check(int R[8], int i=1)
{
    for(int j=1; j<=8; j++)
    {
        for(int k=1; k<=8; k++)
        {
            if(R[i]==R[j]) return false;
            if(R[j]==R[j]) return false;
        }
        i++;
    }
    return true;
}

void oBT::backtrack(int R[8], int i=1)
{
    for(int j=1; j<=8; j++)
        for(int k=1; k<=8; k++)
        {
            R[j]=1;
            if(check(R))
                if(i<8) backtrack(R,i+1);
                else { write(R); clean(R); }
        }
}

and when I try to compile it, I get the following error:

C:\OJI\Eight Queen Puzzle\Class.h|8|error: prototype for 'void oBT::clean(int (*)[8])' does not match any in class 'oBT'|
C:\OJI\Eight Queen Puzzle\Class.h|2|error: candidate is: void oBT::clean(int**)|
C:\OJI\Eight Queen Puzzle\Class.h|11|error: prototype for 'void oBT::write(int*)' does not match any in class 'oBT'|
C:\OJI\Eight Queen Puzzle\Class.h|3|error: candidate is: void oBT::write(int**)|
C:\OJI\Eight Queen Puzzle\Class.h|22|error: prototype for 'bool oBT::check(int*, int)' does not match any in class 'oBT'|
C:\OJI\Eight Queen Puzzle\Class.h|4|error: candidate is: bool oBT::check(int**)|
C:\OJI\Eight Queen Puzzle\Class.h|36|error: prototype for 'void oBT::backtrack(int*, int)' does not match any in class 'oBT'|
C:\OJI\Eight Queen Puzzle\Class.h|5|error: candidate is: void oBT::backtrack(int**, int)|

||=== Build finished: 8 errors, x warnings ===|

user529758 · Accepted Answer · 2012-11-01 21:13:11Z

3

Arrays are not pointers, and pointers are not arrays. If you want to pass in multidimensional arrays, either use double pointers and dynamic memory allocation (i. e. new), or declare your functions to accept an array of arrays, like

void clean(int parm[8][8]);

etc.

Also, your check function has a 'typo', you omitted the 'size' argument from the prototype; instead of

bool check(int **);

it should be

bool check(int R[8][8], int i);

answered Nov 1, 2012 at 21:13

user529758

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2 Comments

user529758 Over a year ago

@UrecheVlad You're welcome. I'd suggest you read a paper on C pointers and arrays. You can also accept my answer if it helped, thanks.

Ureche Vlad Over a year ago

I know my way around pointers and arrays, but I'm new to classes and function prototypes. I'm going to read into it further. Again, thanks a lot for the help.

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