Compilare: user.cpp: In function ‘int main()’: user.cpp:21:19: warning: unused variable ‘lim’ [-Wunused-variable] int i, j, nr, lim, poz, n, d; ^ user.cpp:23:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("blis.in", "r", stdin); ^ user.cpp:24:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("blis.out", "w", stdout); ^ user.cpp:26:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d\n", &k); ^ user.cpp:27:13: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets (s); ^ user.cpp:33:21: warning: ‘nr’ may be used uninitialized in this function [-Wmaybe-uninitialized] nr = nr * 2 + s [i] - '0'; ^ /tmp/ccYDite0.o: In function `main': user.cpp:(.text.startup+0x6a): warning: the `gets' function is dangerous and should not be used.