Compilare: user.cpp: In function ‘int main()’: user.cpp:15:16: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if (x >= 'a' && x <= 'z' || x >= 'A' && x <= 'Z') ^ user.cpp:22:18: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if (x >= 'a' && x <= 'z' || x >= 'A' && x <= 'Z') { ^