Compilare: user.cpp: In function ‘int endOfExp()’: user.cpp:26:6: warning: value computed is not used [-Wunused-value] *p--; ^ user.cpp:27:10: warning: NULL used in arithmetic [-Wpointer-arith] if(*p ==NULL) ^ user.cpp:30:7: warning: value computed is not used [-Wunused-value] *p++; ^ user.cpp: In function ‘int eval(int, int, char)’: user.cpp:22:1: warning: control reaches end of non-void function [-Wreturn-type] } ^