Compilare: user.cpp: In function ‘int eval()’: user.cpp:14:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(s[p] == '+' || s[p] == '-'){ ^ user.cpp:14:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(s[p] == '+' || s[p] == '-'){ ^ user.cpp:15:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] switch(s[p]){ ^ user.cpp: In function ‘int termen()’: user.cpp:32:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(s[p] == '*' || s[p] == '/'){ ^ user.cpp:32:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(s[p] == '*' || s[p] == '/'){ ^ user.cpp:33:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] switch(s[p]){ ^ user.cpp: In function ‘int factor()’: user.cpp:50:11: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(s[p] == '('){ ^ user.cpp:55:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(s[p] >= '0' && s[p] <= '9'){ ^ user.cpp:55:33: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(s[p] >= '0' && s[p] <= '9'){ ^ user.cpp:56:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] r = r * 10 + s[p] - '0'; ^