Compilare: user.cpp: In function ‘int main()’: user.cpp:14:20: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(ch>='a' && ch<='z' || ch>='A' && ch<='Z') ~~~~~~~~^~~~~~~~~~ user.cpp:40:17: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(ch>='a' && ch<='z' || ch>='A' && ch<='Z') ~~~~~~~~^~~~~~~~~~