casting pointers/arrays to multidimensional arrays

Hi to all,

would any of you gentlemen please comment on the reinterpret_casts in
the code below?
Do you think they're ok or not? Any reference to the standard would be
greatly appreciated.

Thank in advance,
FB

//CODE
#include <iostream>
#include <iomanip>

typedef float ( * tMtx )[ 4 ];

void Fill( tMtx inMtx )
{
    for( int c = 0; c < 16; ++c )
        inMtx[ c / 4 ][ c % 4 ] = c;
}

void Print( tMtx inMtx )
{
    std::cout << "n->" << inMtx << std::endl;
    for( int c1 = 0; c1 < 4; ++c1 )
    {
        for( int c2 = 0; c2 < 4; ++c2 )
            std::cout << std::setw( 5 ) << inMtx[ c1 ][ c2 ];
        std::cout << std::endl;
    }
    std::cout << std::endl;
}

int main()
{
    float mtx1[ 16 ] = { 0 };
    float mtx2[ 4 ][ 4 ];
    float * mtx3 = new float[ 16 ];
    float * mtx4 = reinterpret_cast< float * >( new float[ 4 ][ 4 ] );

    // are these casts OK?
    Fill( reinterpret_cast< tMtx >( mtx1 ) );
    Fill( mtx2 );
    Fill( reinterpret_cast< tMtx >( mtx3 ) );
    Fill( reinterpret_cast< tMtx >( mtx4 ) );

    Print( reinterpret_cast< tMtx >( mtx1 ) );
    Print( mtx2 );
    Print( reinterpret_cast< tMtx >( mtx3 ) );
    Print( reinterpret_cast< tMtx >( mtx4 ) );

    delete[] mtx3;
    delete[] mtx4;

    std::cin.get();
}
//ENDCODE