Compilare: user.cpp: In function ‘int main()’: user.cpp:15:22: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(c[a]>='A' && c[a]<='Z' || c[a]>='a' && c[a]<='z') ^ user.cpp:20:28: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] while(c[a]>='A' && c[a]<='Z' || c[a]>='a' && c[a]<='z'){ ^