/in/foo.c: In function 'main':
/in/foo.c:5:15: warning: unused variable 'j' [-Wunused-variable]
    5 |         int i,j;
      |               ^
/in/foo.c:5:13: warning: unused variable 'i' [-Wunused-variable]
    5 |         int i,j;
      |             ^
/in/foo.c:18:25: warning: iteration 2 invokes undefined behavior [-Waggressive-loop-optimizations]
   18 |                         printf("%d",b[i][j]);
      |                         ^~~~~~~~~~~~~~~~~~~~
/in/foo.c:17:30: note: within this loop
   17 |                 for(int j=0;j<3;j++){
      |                             ~^~