Compilare: user.cpp: In function ‘void Back(int)’: user.cpp:30:5: warning: ‘nr1’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(nr2>nr1)return; ^ user.cpp:19:9: note: ‘nr1’ was declared here int nr1,nr2; ^ user.cpp:30:5: warning: ‘nr2’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(nr2>nr1)return; ^ user.cpp:19:13: note: ‘nr2’ was declared here int nr1,nr2; ^