prog.c: In function ‘main’:
prog.c:14:12: error: assignment to ‘int **’ from incompatible pointer type ‘int (*)[2][2]’ [-Werror=incompatible-pointer-types]
ptr2[0]=&a[0];
^
prog.c:15:12: error: assignment to ‘int **’ from incompatible pointer type ‘int (*)[2][2]’ [-Werror=incompatible-pointer-types]
ptr2[1]=&a[1];
^
cc1: all warnings being treated as errors