Compilare: user.cpp: In function ‘int main()’: user.cpp:37:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("barbar.in", "r", stdin); ^ user.cpp:38:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("barbar.out", "w", stdout); ^ user.cpp:40:35: warning: ignoring return value of ‘ssize_t read(int, void*, size_t)’, declared with attribute warn_unused_result [-Wunused-result] read(STDIN_FILENO, buf, CHUNK); ^ user.cpp:35:18: warning: ‘in.point::l’ may be used uninitialized in this function [-Wmaybe-uninitialized] struct point in, p; ^~ user.cpp:35:18: warning: ‘in.point::c’ may be used uninitialized in this function [-Wmaybe-uninitialized]