Compilare: user.cpp: In function ‘int main()’: user.cpp:19:22: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(s[i]<='z' and s[i]>='a' or s[i]<='Z' and s[i]>='A'){ ^ user.cpp:22:29: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] while(s[i]<='z' and s[i]>='a' or s[i]<='Z' and s[i]>='A') ++i; ^