Compilare: user.cpp: In function ‘int main()’: user.cpp:42:10: warning: unused variable ‘f_hour’ [-Wunused-variable] double f_hour, f_min; ^ user.cpp:42:18: warning: unused variable ‘f_min’ [-Wunused-variable] double f_hour, f_min; ^ user.cpp:31:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(IN_FILE_NAME, "r", stdin); ^ user.cpp:32:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(OUT_FILE_NAME, "w", stdout); ^ user.cpp:34:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &tests); ^ user.cpp:39:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &hour, &min); ^