/in/foo.c: In function 'main':
/in/foo.c:6:4: warning: 'a' is used uninitialized in this function [-Wuninitialized]
  if(a<b)
    ^
/in/foo.c:6:4: warning: 'b' is used uninitialized in this function [-Wuninitialized]
/in/foo.c:8:4: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized]
    printf("%d<%d<%d\n",a,b,c);
    ^~~~~~~~~~~~~~~~~~~~~~~~~~