Compilare: user.cpp: In function ‘bool prim(unsigned int)’: user.cpp:8:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=2;i<n;++i){ ^ user.cpp:11:12: warning: ‘qwe’ may be used uninitialized in this function [-Wmaybe-uninitialized] return qwe; ^ user.cpp: In function ‘int main()’: user.cpp:24:15: warning: ‘qwe’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (prim(a)&&prim(b)) fout<<"0"; ^ user.cpp:24:15: warning: ‘qwe’ may be used uninitialized in this function [-Wmaybe-uninitialized]