Compilare: user.cpp: In function ‘int factor()’: user.cpp:14:11: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(s[i] == '('){ ^ user.cpp:21:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(s[i] >= '0' && s[i] <= '9'){ ^ user.cpp:21:33: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(s[i] >= '0' && s[i] <= '9'){ ^ user.cpp:22:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] r = r * 10 + s[i] - '0'; ^ user.cpp: In function ‘int termen()’: user.cpp:32:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(s[i] == '*' || s[i] == '/'){ ^ user.cpp:32:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(s[i] == '*' || s[i] == '/'){ ^ user.cpp:33:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(s[i] == '*'){ ^ user.cpp: In function ‘int expresie()’: user.cpp:48:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(s[i] == '+' || s[i] == '-'){ ^ user.cpp:48:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(s[i] == '+' || s[i] == '-'){ ^ user.cpp:49:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(s[i] == '+'){ ^