/in/foo.cc: In function 'int main()':
/in/foo.cc:8:13: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
  else if(x=0)
             ^
/in/foo.cc:10:7: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
  else if(x<0)
       ^~
/in/foo.cc:12:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
   return 0;
   ^~~~~~
/in/foo.cc:4:8: warning: unused variable 'y' [-Wunused-variable]
  int x,y;
        ^