Compilare: user.cpp: In function ‘int main()’: user.cpp:21:30: warning: operation on ‘pr[42]’ may be undefined [-Wsequence-point] pr['*']=pr['/']=pr['*']=2; ^ user.cpp:54:33: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(pr[opi]<=pr[sto[vfso]]) ^ user.cpp:54:48: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(pr[opi]<=pr[sto[vfso]]) ^ user.cpp:22:13: warning: unused variable ‘opi’ [-Wunused-variable] char op,opi; ^ user.cpp:63:49: warning: ‘rez’ may be used uninitialized in this function [-Wmaybe-uninitialized] vfsv--;stv[vfsv]=rez; ^