int n;
for(int t=-n+1; t<n; ++t)
{
    doSomething( n, t);
    doSomething(-n, t);
    doSomething( t, n);
    doSomething( t,-n);
}
doSomething( n, n);
doSomething( n,-n);
doSomething(-n, n);
doSomething(-n,-n);