/in/foo.c: In function 'main':
/in/foo.c:6:11: warning: 'x' is used uninitialized [-Wuninitialized]
    6 |         if(x>=-100&&x<0)
      |           ^
/in/foo.c:5:15: note: 'x' was declared here
    5 |         float x,y;
      |               ^