/in/foo.c: In function 'avg':
/in/foo.c:13:10: warning: unused variable 'ptr_x' [-Wunused-variable]
   type * ptr_x=&data[index_i];\
          ^
/in/foo.c:36:2: note: in expansion of macro 'mapTo'
  mapTo(data,n,int,sum+=x);
  ^~~~~
/in/foo.c: In function 'main':
/in/foo.c:93:12: warning: unknown escape sequence: '\]'
     printf("\[%ld\]",a);
            ^~~~~~~~~