Compilare: user.cpp: In function 'int main()': user.cpp:67: warning: comparison between signed and unsigned integer expressions user.cpp:79: warning: comparison between signed and unsigned integer expressions user.cpp:57: warning: 'a' may be used uninitialized in this function /tmp/ccX3tEwt.o: In function `main': user.cpp:(.text+0x22d): warning: the `gets' function is dangerous and should not be used.