/in/foo.c: In function 'main':
/in/foo.c:20:6: warning: 'sum' may be used uninitialized in this function [-Wmaybe-uninitialized]
   sum=sum*i;
      ^
/in/foo.c:15:8: note: 'sum' was declared here
  int i,sum;
        ^
/in/foo.c:20:6: warning: 'sum' may be used uninitialized in this function [-Wmaybe-uninitialized]
   sum=sum*i;
      ^
/in/foo.c:15:8: note: 'sum' was declared here
  int i,sum;
        ^
/in/foo.c:20:6: warning: 'sum' may be used uninitialized in this function [-Wmaybe-uninitialized]
   sum=sum*i;
      ^
/in/foo.c:15:8: note: 'sum' was declared here
  int i,sum;
        ^
/in/foo.c: In function 'x':
/in/foo.c:15:8: warning: 'sum' may be used uninitialized in this function [-Wmaybe-uninitialized]