Compilare: user.cpp: In function ‘int main()’: user.cpp:19:15: warning: NULL used in arithmetic [-Wpointer-arith] while(*p!=NULL) ^ user.cpp:24:31: warning: operation on ‘st’ may be undefined [-Wsequence-point] v[++st]=v[st-1]*SP; ^ user.cpp:33:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] rasp[(*p)]+=v[st--]; ^ user.cpp:34:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] ap[(*p)]=1; ^ user.cpp:39:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] rasp[(*p)]+=v[st]; ^ user.cpp:40:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] ap[(*p)]=1; ^ user.cpp:13:9: warning: variable ‘l’ set but not used [-Wunused-but-set-variable] int l; ^ /tmp/ccWoZXOD.o: In function `main': user.cpp:(.text.startup+0x4c): warning: the `gets' function is dangerous and should not be used.