/in/foo.c: In function 'main':
/in/foo.c:5:6: error: 'count' undeclared (first use in this function)
      count<<"Hello!<<end1;
      ^~~~~
/in/foo.c:5:6: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:5:13: warning: missing terminating " character
      count<<"Hello!<<end1;
             ^
/in/foo.c:5:13: error: missing terminating " character
      count<<"Hello!<<end1;
             ^~~~~~~~~~~~~~
/in/foo.c:6:27: error: 'end1' undeclared (first use in this function)
   count<<"welcome to C!"<<end1;
                           ^~~~