Compilare: main.cpp: In function 'int Evalueaza()': main.cpp:47:20: warning: NULL used in arithmetic [-Wpointer-arith] while (s[i] != NULL) ^~~~ main.cpp:56:27: warning: NULL used in arithmetic [-Wpointer-arith] while (s[i]!= NULL && s[i] >= '0' && s[i] <= '9') ^~~~ main.cpp: In function 'int AplicareOp(int, int, char)': main.cpp:40:1: warning: control reaches end of non-void function [-Wreturn-type] } ^