descfib.cpp: In member function 'HugeN HugeN::scan(char*)': descfib.cpp:41: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result descfib.cpp: In function 'int main()': descfib.cpp:150: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result descfib.cpp:151: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result /tmp/ccepmnRl.o: In function `main': descfib.cpp:(.text+0x546): warning: the `gets' function is dangerous and should not be used.