Compilare: user.cpp: In function ‘long long int eval()’: user.cpp:13:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(s[i]=='+'||s[i]=='-') ^ user.cpp:13:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(s[i]=='+'||s[i]=='-') ^ user.cpp:15:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(s[i]=='+') ^ user.cpp:20:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] else if(s[i]=='-') ^ user.cpp: In function ‘long long int termen()’: user.cpp:32:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] while (s[i]=='*'||s[i]=='/') ^ user.cpp:32:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] while (s[i]=='*'||s[i]=='/') ^ user.cpp:34:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(s[i]=='*') ^ user.cpp:39:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] else if(s[i]=='/') ^ user.cpp: In function ‘long long int factor()’: user.cpp:51:11: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(s[i]=='(') ^ user.cpp:59:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(s[i]>='0'&&s[i]<='9') ^ user.cpp:59:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(s[i]>='0'&&s[i]<='9') ^ user.cpp:61:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] r=r*10+s[i]-'0'; ^