/in/foo.c: In function 'main':
/in/foo.c:8:17: warning: unused variable 'c' [-Wunused-variable]
  int a[10000],n,c;
                 ^
/in/foo.c: In function 'Input':
/in/foo.c:19:6: error: 'i' undeclared (first use in this function)
  for(i=0; c<n; c++)
      ^
/in/foo.c:19:6: note: each undeclared identifier is reported only once for each function it appears in