/in/foo.c: In function 'main':
/in/foo.c:37:17: error: request for member 'n3' in something not a structure or union
  Setlnter(a,c,n1.n3);
                 ^
/in/foo.c:37:2: error: too few arguments to function 'Setlnter'
  Setlnter(a,c,n1.n3);
  ^~~~~~~~
/in/foo.c:2:6: note: declared here
 void Setlnter(int *a,int *b,int n1,int n2)
      ^~~~~~~~