Compilare: user.cpp: In function ‘int main()’: user.cpp:11: warning: unused variable ‘it’ user.cpp:13: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:14: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:16: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result /tmp/cc5jiN0T.o: In function `main': user.cpp:(.text+0x5d): warning: the `gets' function is dangerous and should not be used.