/in/foo.c: In function 'f':
/in/foo.c:71:2: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
  else if(a=4)
  ^~~~
/in/foo.c:27:6: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
  int x;
      ^