Compilare: user.cpp: In function ‘int main()’: user.cpp:48:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(v2>0&&pr[s[i]]<=pr[st2[v2]]){ ^ user.cpp:48:45: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(v2>0&&pr[s[i]]<=pr[st2[v2]]){ ^ user.cpp: In function ‘int calcul(int, int, char)’: user.cpp:17:1: warning: control reaches end of non-void function [-Wreturn-type] } ^