Compilare: main.cpp: In function 'int prima_cerinta(char*)': main.cpp:14:19: warning: NULL used in arithmetic [-Wpointer-arith] while(s[i] != NULL) ^~~~ main.cpp: In function 'std::__cxx11::string evaluare()': main.cpp:31:19: warning: NULL used in arithmetic [-Wpointer-arith] while(s[p] != NULL) ^~~~ main.cpp: In function 'std::__cxx11::string paranteza_dreapta()': main.cpp:135:10: warning: variable 'inceput' set but not used [-Wunused-but-set-variable] bool inceput = false; ^~~~~~~