Compilare: user.cpp: In function ‘int main()’: user.cpp:11:10: warning: statement has no effect [-Wunused-value] for(i==2;i<=n;i++) ^ user.cpp:12:14: warning: statement has no effect [-Wunused-value] for(j==1;j<=n;j++) ^ user.cpp:11:5: warning: ‘i’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(i==2;i<=n;i++) ^ user.cpp:6:13: warning: ‘j’ may be used uninitialized in this function [-Wmaybe-uninitialized] int n,i,j,k; ^