foo.c: In function 'main':
foo.c:5:19: warning: unused variable 'cx' [-Wunused-variable]
     int n,x,cnt=0,cx=0;
                   ^
foo.c:8:4: warning: 'n' may be used uninitialized in this function [-Wmaybe-uninitialized]
   n=n/10;
    ^