Compilare: user.cpp: In function ‘int main()’: user.cpp:8:7: warning: unused variable ‘ok’ [-Wunused-variable] bool ok=false; ^ user.cpp:46:7: warning: ‘y’ may be used uninitialized in this function [-Wmaybe-uninitialized] b<<y-x+1<<endl; ^ user.cpp:47:3: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(i=x;i<maxnr;i++) ^