Compilare: user.cpp: In function ‘int eval()’: user.cpp:17:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] while (s[i]=='+' || s[i]=='-') { ^ user.cpp:17:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] while (s[i]=='+' || s[i]=='-') { ^ user.cpp:18:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (s[i]=='+') { i++; v+=termen();} ^ user.cpp: In function ‘int termen()’: user.cpp:29:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] while (s[i] =='*' || s[i]=='/') { ^ user.cpp:29:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] while (s[i] =='*' || s[i]=='/') { ^ user.cpp:30:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (s[i]=='*') {i++; v*=factor();} ^ user.cpp: In function ‘int factor()’: user.cpp:41:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (s[i]=='(') {i++; v=eval(); i++;} ^ user.cpp:43:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] while (s[i]>='0' && s[i]<='9') { ^ user.cpp:43:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] while (s[i]>='0' && s[i]<='9') { ^ user.cpp:44:33: warning: array subscript has type ‘char’ [-Wchar-subscripts] v=v*10+(int)(s[i]-'0'); ^