Compilare: user.cpp: In function ‘void read()’: user.cpp:17: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result user.cpp:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result /tmp/ccODvEDe.o: In function `read()': user.cpp:(.text+0x2ed): warning: the `gets' function is dangerous and should not be used.