/in/foo.c: In function 'main':
/in/foo.c:10:8: warning: left-hand operand of comma expression has no effect [-Wunused-value]
  if(x>0,y>0)
        ^
/in/foo.c:12:13: warning: left-hand operand of comma expression has no effect [-Wunused-value]
  else if(x<0,y>0)
             ^
/in/foo.c:14:13: warning: left-hand operand of comma expression has no effect [-Wunused-value]
  else if(x<0,y<0)
             ^
/in/foo.c:16:13: warning: left-hand operand of comma expression has no effect [-Wunused-value]
  else if(x>0,y<0)
             ^