rege.cpp: In function 'int main()': rege.cpp:23: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result rege.cpp:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result rege.cpp: In function 'void ReadData()': rege.cpp:196: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result rege.cpp:197: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result rege.cpp:198: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result