spam.cpp: In function `void det_sol()': spam.cpp:70: warning: assignment to non-pointer type `char' from NULL spam.cpp:70: warning: argument to non-pointer type `char' from NULL spam.cpp:80: warning: assignment to non-pointer type `char' from NULL spam.cpp:80: warning: argument to non-pointer type `char' from NULL spam.cpp:85: warning: assignment to non-pointer type `char' from NULL spam.cpp:85: warning: argument to non-pointer type `char' from NULL spam.cpp:90: warning: assignment to non-pointer type `char' from NULL spam.cpp:90: warning: argument to non-pointer type `char' from NULL spam.cpp:101: warning: assignment to non-pointer type `char' from NULL spam.cpp:101: warning: argument to non-pointer type `char' from NULL