/in/foo.c: In function 'main':
/in/foo.c:7:9: warning: too many arguments for format [-Wformat-extra-args]
  printf("\n",&a[2][3]);
         ^~~~
/in/foo.c:17:9: warning: too many arguments for format [-Wformat-extra-args]
  printf("\n",b[3][2]);
         ^~~~
/in/foo.c:20:10: warning: unknown escape sequence: '\040'
   printf("%d\ ",b[n][m]);
          ^~~~~~
/in/foo.c:17:2: warning: array subscript is above array bounds [-Warray-bounds]
  printf("\n",b[3][2]);
  ^~~~~~~~~~~~~~~~~~~~
/in/foo.c:17:15: warning: array subscript is above array bounds [-Warray-bounds]
  printf("\n",b[3][2]);
              ~^~~