/in/foo.c: In function 'main':
/in/foo.c:9:16: warning: 'i' is used uninitialized [-Wuninitialized]
    9 |         while(i>0)
      |               ~^~
/in/foo.c:5:20: note: 'i' was declared here
    5 |     long int x1,x2,i,xx1,xx2;
      |                    ^