adun.cpp: In function `int main()': adun.cpp:19: warning: suggest parentheses around assignment used as truth value adun.cpp:21: warning: assignment to non-pointer type `char' from NULL adun.cpp:21: warning: argument to non-pointer type `char' from NULL adun.cpp:24: warning: suggest parentheses around assignment used as truth value adun.cpp:26: warning: assignment to non-pointer type `char' from NULL adun.cpp:26: warning: argument to non-pointer type `char' from NULL adun.cpp:32: warning: assignment to non-pointer type `char' from NULL adun.cpp:32: warning: argument to non-pointer type `char' from NULL adun.cpp:38: warning: assignment to non-pointer type `char' from NULL adun.cpp:38: warning: argument to non-pointer type `char' from NULL