Compilare: user.cpp: In function ‘int main()’: user.cpp:80:7: warning: unused variable ‘nr’ [-Wunused-variable] int nr=0, len=strlen(s), db=0; ^ user.cpp:80:13: warning: unused variable ‘len’ [-Wunused-variable] int nr=0, len=strlen(s), db=0; ^ user.cpp:80:28: warning: unused variable ‘db’ [-Wunused-variable] int nr=0, len=strlen(s), db=0; ^ user.cpp:68:18: warning: unused variable ‘j’ [-Wunused-variable] int n, I, T, i, j,z,k; ^ user.cpp:68:20: warning: unused variable ‘z’ [-Wunused-variable] int n, I, T, i, j,z,k; ^ /tmp/ccYd5XRs.o: In function `main': user.cpp:(.text.startup+0xd6): warning: the `gets' function is dangerous and should not be used.