dir.cpp: In function `int main()': dir.cpp:37: warning: assignment to non-pointer type `char' from NULL dir.cpp:37: warning: argument to non-pointer type `char' from NULL dir.cpp:46: warning: assignment to non-pointer type `char' from NULL dir.cpp:46: warning: argument to non-pointer type `char' from NULL dir.cpp:49: warning: assignment to non-pointer type `char' from NULL dir.cpp:49: warning: argument to non-pointer type `char' from NULL dir.cpp:62: warning: assignment to non-pointer type `char' from NULL dir.cpp:62: warning: argument to non-pointer type `char' from NULL dir.cpp:65: warning: assignment to non-pointer type `char' from NULL dir.cpp:65: warning: argument to non-pointer type `char' from NULL