/in/foo.c: In function 'main':
/in/foo.c:9:3: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   for(t=i;t;t=t/10)
   ^~~
/in/foo.c:12:4: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
    if(!t)
    ^~
/in/foo.c: In function 'sushu':
/in/foo.c:21:8: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if(n>2&&!(n&1)||n<2)
     ~~~^~~~~~~~
/in/foo.c:23:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(i=3;i*i<=n;i+=2)
  ^~~
/in/foo.c:26:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   return 0;
   ^~~~~~