Compilare: user.cpp: In function ‘int main()’: user.cpp:25:8: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] f>>s+1; ^ user.cpp:49:53: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(vf1>0&&pr[s[i]]<=pr[st2[vf2]]){ ^ user.cpp:49:67: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(vf1>0&&pr[s[i]]<=pr[st2[vf2]]){ ^ user.cpp: In function ‘int calcul(int, int, char)’: user.cpp:17:5: warning: control reaches end of non-void function [-Wreturn-type] } ^