Compilare: user.cpp: In function ‘long long int eval()’: user.cpp:16:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(s[i]=='+'||s[i]=='-') ^ user.cpp:16:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(s[i]=='+'||s[i]=='-') ^ user.cpp:18:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(s[i]=='+') ^ user.cpp: In function ‘long long int termen()’: user.cpp:37:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] while (s[i]=='*'||s[i]=='/') ^ user.cpp:37:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] while (s[i]=='*'||s[i]=='/') ^ user.cpp:39:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(s[i]=='*') ^ user.cpp: In function ‘long long int factor()’: user.cpp:56:11: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(s[i]=='(') ^ user.cpp:64:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] while('0'<=s[i]&&s[i]<='9') ^ user.cpp:64:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] while('0'<=s[i]&&s[i]<='9') ^ user.cpp:66:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] r=r*10+s[i]-'0'; ^