Compilare: user.cpp: In function ‘int NOT()’: user.cpp:29:53: warning: array subscript has type ‘char’ [-Wchar-subscripts] else if (isalpha(sir[ind])) nr = Litera[sir[ind]], ++ind; ^ user.cpp: In function ‘int main()’: user.cpp:67:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] ind = 1, Litera[q[i]] ^= 1; ^ user.cpp:53:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bool.in", "r", stdin); ^ user.cpp:54:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bool.out", "w", stdout); ^ user.cpp:56:35: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s + 1), n = strlen(s + 1); ^ user.cpp:58:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &Q); ^ user.cpp:60:16: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(q + 1); ^ /tmp/cc73Aj7C.o: In function `main': user.cpp:(.text.startup+0x53): warning: the `gets' function is dangerous and should not be used.