/in/foo.c: In function 'main':
/in/foo.c:17:3: warning: iteration 2 invokes undefined behavior [-Waggressive-loop-optimizations]
   printf("%d ",a[i]);
   ^~~~~~~~~~~~~~~~~~
/in/foo.c:16:2: note: within this loop
  for(i=0;i<3;i++)
  ^~~
/in/foo.c:9:13: warning: iteration 1 invokes undefined behavior [-Waggressive-loop-optimizations]
    if(a[k]>a[k+1])
            ~^~~~~
/in/foo.c:8:3: note: within this loop
   for(k=0;k<2;k++)
   ^~~
/in/foo.c:9:13: warning: array subscript is above array bounds [-Warray-bounds]
    if(a[k]>a[k+1])
            ~^~~~~
/in/foo.c:13:6: warning: array subscript is above array bounds [-Warray-bounds]
     a[k+1]=tmp;
     ~^~~~~