Compilare: user.cpp: In function ‘void OpenFiles(int)’: user.cpp:20: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:21: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:24: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:25: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘int main(int, char**)’: user.cpp:47: warning: unused variable ‘t’ user.cpp:47: warning: unused variable ‘a’ user.cpp:47: warning: unused variable ‘b’ user.cpp:47: warning: unused variable ‘c’ user.cpp:47: warning: unused variable ‘d’ user.cpp:47: warning: unused variable ‘x’ user.cpp:47: warning: unused variable ‘y’ user.cpp:48: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:52: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result