Compilare: user.cpp: In function ‘int main()’: user.cpp:52:74: warning: use of ‘ll’ length modifier with ‘f’ type character [-Wformat=] scanf("%llf %llf %llf %llf\n", &aux.x1, &aux.y1, &aux.x2, &aux.y2); ^ user.cpp:52:74: warning: use of ‘ll’ length modifier with ‘f’ type character [-Wformat=] user.cpp:52:74: warning: use of ‘ll’ length modifier with ‘f’ type character [-Wformat=] user.cpp:52:74: warning: use of ‘ll’ length modifier with ‘f’ type character [-Wformat=] user.cpp:46:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("geometry.in","r",stdin); ^ user.cpp:47:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("geometry.out","w",stdout); ^ user.cpp:49:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &n); ^ user.cpp:52:75: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%llf %llf %llf %llf\n", &aux.x1, &aux.y1, &aux.x2, &aux.y2); ^