Compilare: user.cpp: In function 'int eval()': user.cpp:14: warning: unused variable 's' user.cpp: In function 'int t()': user.cpp:33: warning: unused variable 'nr' user.cpp: In function 'int f()': user.cpp:68: warning: control reaches end of non-void function user.cpp: In function 'int eval()': user.cpp:29: warning: control reaches end of non-void function /tmp/cceKBf1W.o: In function `main': user.cpp:(.text+0x1a3): warning: the `gets' function is dangerous and should not be used.