/in/foo.c: In function 'FindiMax':
/in/foo.c:14:9: warning: 'j' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return j;
         ^
/in/foo.c: In function 'main':
/in/foo.c:24:2: warning: 'j' may be used uninitialized in this function [-Wmaybe-uninitialized]
  printf("%d",FindiMax(a,n));
  ^~~~~~~~~~~~~~~~~~~~~~~~~~