/in/foo.c: In function 'main':
/in/foo.c:6:2: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
  if(xmin<=xmax)
  ^~
/in/foo.c:9:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
   printf("%d\n",sum);
   ^~~~~~
/in/foo.c:9:3: warning: 'sum' may be used uninitialized in this function [-Wmaybe-uninitialized]
   printf("%d\n",sum);
   ^~~~~~~~~~~~~~~~~~