Compilare: user.cpp: In function ‘void work()’: user.cpp:63: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:64: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:65: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:68: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result /tmp/ccraglBO.o: In function `work()': user.cpp:(.text+0x1b8): warning: the `gets' function is dangerous and should not be used.