bifo.cpp: In function 'int main()': bifo.cpp:120: warning: unused variable 'pos' bifo.cpp:92: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result bifo.cpp:93: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result bifo.cpp:95: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result bifo.cpp:96: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result bifo.cpp:108: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result bifo.cpp:112: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result bifo.cpp:116: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result /tmp/cc0plIbD.o: In function `main': bifo.cpp:(.text+0x86): warning: the `gets' function is dangerous and should not be used.