descfib.cpp: In function 'int main()': descfib.cpp:94: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result descfib.cpp:95: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result descfib.cpp:96: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result /tmp/cc1MOMCv.o: In function `main': descfib.cpp:(.text+0x2e9): warning: the `gets' function is dangerous and should not be used.