secvnumber.cpp: In function 'int main()': secvnumber.cpp:87: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result secvnumber.cpp:88: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result secvnumber.cpp:89: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result secvnumber.cpp:95: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result secvnumber.cpp:100: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result secvnumber.cpp:102: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result