Compilare: user.cpp: In function ‘int check()’: user.cpp:24:17: warning: unused variable ‘j’ [-Wunused-variable] int lim, i, j, code; ^ user.cpp: In function ‘int main()’: user.cpp:20:25: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] return x & (1 << bit); ^ user.cpp:52:9: note: ‘x’ was declared here int x, i, lim; ^