mess.cpp: In function 'int main()': mess.cpp:96: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result mess.cpp:97: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result mess.cpp:98: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result mess.cpp:100: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result mess.cpp:106: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result mess.cpp:108: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result mess.cpp:113: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result