Compilare: user.cpp: In function ‘void read()’: user.cpp:6: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:7: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:8: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result user.cpp:9: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result /tmp/ccgbnIOr.o: In function `read()': user.cpp:(.text+0xc0): warning: the `gets' function is dangerous and should not be used.