Compilare: user.cpp: In function ‘int main()’: user.cpp:21:11: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] cin>>s+1; ^ user.cpp:72:41: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(vf1>0&&pr[s[i]]<=pr[op[vf]]) ^ user.cpp:72:53: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(vf1>0&&pr[s[i]]<=pr[op[vf]]) ^ user.cpp: In function ‘int calcul(char, int, int)’: user.cpp:16:1: warning: control reaches end of non-void function [-Wreturn-type] } ^