Borderou de evaluare (job #205603)

Compilare: user.cpp: In function ‘int main()’: user.cpp:17:8: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] user.cpp:19:23: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] user.cpp:21:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:21:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:31:8: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] user.cpp:33:23: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] user.cpp:35:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:35:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]