overload contructors || check bounds of array

i need to overload a constructor to specify dimensions in a 2-d array and check to see if its within the bounds of 10x10. and i keep getting errors on my attempt. for clarity ill just include the whole class.

Code:

class matrix
{

private:
        int lim1,lim2;
        int mtx[lim1][lim2];

public:
        matrix():       lim1(10),lim2(10)
        {       }
        matrix(int x,int y): lim1(x),lim2(y)    //RESTRICT defined as 10
        {
                if(x < RESTRICT-1 || y < RESTRICT-1)
                {
                        lim1 = x;
                        lim2 = y;
                }
                else
                        cout << "Error:  specified array too large." << endl;
        }
        void putel(int index1,int index2,int value)
        {
                if(index1 <= RESTRICT-1 && index2 <= RESTRICT-1)
                        mtx[index1][index2] = value;
                else
                        cout << "Error: exceeded limits of array" << endl;
        }

        int getel(int index1,int index2)
        {
                if(index1 <= RESTRICT-1 && index2 <= RESTRICT-1)
                {
                        int tmp = mtx[index1][index2];
                        return tmp;
                }
                else
                        cout << "Error: exceeded limits of array" << endl;
        }
};
//errors
ch7_ex10.cpp:11: error: invalid use of member `matrix::lim1'
ch7_ex10.cpp:11: error: invalid use of member `matrix::lim2'
ch7_ex10.cpp: In member function `void matrix::putel(int, int, int)':
ch7_ex10.cpp:29: error: `mtx' undeclared (first use this function)
ch7_ex10.cpp:29: error: (Each undeclared identifier is reported only once for 
   each function it appears in.)

cant figure out why it says invalid use of member...help much appreciated. thanks in advance

>int mtx[lim1][lim2];

You cant say that because lim1 and lim2 are undefined.

You have to say:

int mtx[][];

OR:

int **mtx;

AFTER lim1 and lim2 become defined, THEN you can resize the matrix as such:

mtx = new int[lim1][];
for ( int k = 0; k < lim1; k++ )
{
mtx[k] = new int[lim2];
}

thanks. deleting lim1 and lim2 worked. before all this i tried setting lim1 = lim2 = 10. but somehow that didnt work. oh well..fixed now.
i hate arrays