Compilare: user.c: In function 'go': user.c:27: warning: suggest explicit braces to avoid ambiguous 'else' user.c:30: warning: suggest explicit braces to avoid ambiguous 'else' user.c: In function 'back': user.c:65: warning: suggest parentheses around assignment used as truth value user.c:71: warning: suggest parentheses around assignment used as truth value user.c:77: warning: suggest parentheses around assignment used as truth value user.c: At top level: user.c:87: warning: return type of 'main' is not 'int' user.c:104:2: warning: no newline at end of file