Compilare: user.cpp: In function ‘int main()’: user.cpp:12:22: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if (c >= 'a' && c <= 'z' || c >= 'A' && c<= 'Z') ^ user.cpp:15:30: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] while (c >= 'a' && c <= 'z' || c >= 'A' && c<= 'Z') ^