<sigh>

double x = x0, y = y0;

int i = 0;
while(x*x+y*y <= 4 && i < max_iterations)
{
    double xtemp = x*x - y*y + x0;
    y = 2*x*y + y0;
    x = xtemp;
    i++;
}
if (i == max_iterations) return -1;
return i;

-- 
~Mike

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