Compilare: user.cpp: In function ‘void read()’: user.cpp:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:42: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result user.cpp: In function ‘int ok(int)’: user.cpp:61: warning: comparison between signed and unsigned integer expressions /tmp/cc70Wtrp.o: In function `read()': user.cpp:(.text+0x133): warning: the `gets' function is dangerous and should not be used.