bacan.cpp: In function `void copy(char*, char*)': bacan.cpp:8: warning: NULL used in arithmetic bacan.cpp:12: warning: assignment to non-pointer type `char' from NULL bacan.cpp:12: warning: argument to non-pointer type `char' from NULL bacan.cpp: In function `int cmp(char*, char*)': bacan.cpp:17: warning: NULL used in arithmetic bacan.cpp:26: warning: control reaches end of non-void function bacan.cpp: In function `int main()': bacan.cpp:77: warning: assignment to non-pointer type `char' from NULL bacan.cpp:77: warning: argument to non-pointer type `char' from NULL