Square root in C using Newton-Raphson method

Question

In the following code, I want to replace the termination condition to: if the ratio of guess square and x is close to 1, while loop should terminate. I tried various express

Answer 1

# include

double sq_root(double x)
{
    double rt = 1, ort = 0;
    while(ort!=rt)
    {
        ort = rt;
        rt = ((x/rt) + rt) / 2;
    }
    return rt;
}

int main(void)
{
    int i;
    for(i = 2; i<1001; i++) printf("square root of %d is %f\n",i, sq_root(i));
    return 0;
}