Compilare: user.cpp: In function ‘void read()’: user.cpp:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:22: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result user.cpp: In function ‘void do_smen(int)’: user.cpp:58: warning: ‘last’ may be used uninitialized in this function user.cpp:58: warning: ‘lc’ may be used uninitialized in this function /tmp/cc1XdgS3.o: In function `read()': user.cpp:(.text+0x505): warning: the `gets' function is dangerous and should not be used.