Compilare: user.cpp: In function ‘int isLet(char)’: user.cpp:11:20: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] return (cev>'a'&&cev<'z'||cev>'A'&&cev<'Z'); ^ user.cpp: In function ‘int main()’: user.cpp:20:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i<strlen(ceva);i++) ^