用迭代法求近似平方根

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//用迭代法求近似平方根,考試大和你一起學(xué)習(xí)：
    #include
    #include
    using namespace std;
    int main()
    {
    int flag = 0;
    cout<<"please enter a number:";
    double a = 0.0;
    cin>>a;
    const double EPSTLON = 1E-14;
    double xnew = a;
    double xold = 0.0;
    do{
    xold = xnew;
    xnew = (xold + a/xold)/2;
    }while(fabs(xnew - xold) > EPSTLON);
    cout<<"the square root is:"<    cin>>flag;
    return 0;
    }