/in/foo.c: In function 'main':
/in/foo.c:16:3: error: 'count' undeclared (first use in this function)
   count=16;
   ^~~~~
/in/foo.c:16:3: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:8:6: warning: variable 'a' set but not used [-Wunused-but-set-variable]
  int a[100]={0};
      ^