how to point a 2D array?

[q1670741824]

I tried to use a pointer int** to point to a 2 dimentional array, but failed.
could anyone tell me how, cause i want to pass a pointer points to a 2D array.
Or, is that any other ways?

[JLBorges]

constexpr std::size_t NCOLS = 6 ; // const std::size_t NCOLS = 6 ; // C++98

void foo( int (*pointer)[NCOLS], std::size_t nrows ) {}

void bar( int pointer[][NCOLS], std::size_t nrows ) {}

using row_type = int[NCOLS] ; // typedef int row_type[NCOLS] ; // C++98

void baz( row_type* pointer, std::size_t nrows ) {}

void foobar( row_type pointer[], std::size_t nrows ) {}

int main()
{
    constexpr std::size_t NROWS = 100 ; // const std::size_t NROWS = 100 ;

    int a[NROWS][NCOLS] ;
    foo( a, NROWS ) ;
    bar( a, NROWS ) ;
    baz( a, NROWS ) ;
    foobar( a, NROWS ) ;

    row_type b[NROWS] ; // 2d array NROWS x NCOLS
    foo( b, NROWS ) ;
    bar( b, NROWS ) ;
    baz( b, NROWS ) ;
    foobar( b, NROWS ) ;
}