Compilare: user.c: In function 'eval': user.c:9: warning: unused variable 't' user.c: In function 'expresie': user.c:21: warning: suggest parentheses around assignment used as truth value user.c: In function 'eval': user.c:17: warning: control reaches end of non-void function /tmp/ccu4HYVN.o: In function `main': user.c:(.text+0x113): warning: the `gets' function is dangerous and should not be used.