Lagrange Polynomials

I have worked i开发者_高级运维n C language, but now i have been given this work where i will have to use C++. I have to generate lagrange polynomials. Now, i wont ask for the code or anything but i want to know a few of things:

1. How do i go about this code: I ask the user to enter the data (i.e. the x and y coordinates) around which the polynomial is to be developed and give back a polynomial?
2. Will the same concepts of C let me develop this code in C++ environment, i know there would be a few syntax differences, but would i need to know the classes and objects information for this code or will i be good without them too?
3. If anything else i need to know?

Kindly help!

you can pretty much write C and compile it as C++. There might be some exceptions, but hopefully the compiler or a bit or Internet poking should help you there. C++ is a non-strict superset of C.

That said, if you are willing to invest some time in learning the particular facilities of C++, you'll probably find it rewarding. Whether this is worth the time for your particular assignment is a matter of the details of your assignment.

#include<iostream>
    using namespace std;

    int main()
    {
        double arrx[2];
    double arrf[2];
    double x, lx;
    int h;
    system("color C");
    //----------------------------------------------
    cout << "________________LAGRANGE  POLYNOMIAL________________" << endl;
    cout << "                                                    " << endl;
    cout << "Enter 3 values For X :" << endl;
    for (int i = 0; i < 3; i++)
    {
        cout << "                                                " << endl;
        cout << "X" << i << endl;
        cin >> arrx[i];
    }
    cout << "Enter 3 values For F :" << endl;
    for (int j = 0; j < 3; j++)
    {
        cout << "F" << j << endl;
        cin >> arrf[j];
    }
    cout << "How Meany Value ?" << endl;
    cin >> h;
    for (int c = 1; c <= h; c++)
    {
        cout << "______________________________________________________" << endl;
        cout << "Enter f(Value) : " << endl;
        cin >> x;
        cout << "                                                     " << endl;                       //*****Start                                                                                  //****StartTwo            
        lx = ((((x - arrx[1])*(x - arrx[2])) / ((arrx[0] - arrx[1])* (arrx[0] - arrx[2]))) * (arrf[0])) + ((((x - arrx[0])*(x - arrx[2])) / ((arrx[1] - arrx[0])* (arrx[1] - arrx[2]))) * (arrf[1])) + ((((x - arrx[0])*(x - arrx[1])) / ((arrx[2] - arrx[0])* (arrx[2] - arrx[1]))) * (arrf[2]));
        cout << "f(" << x << ")" << "~=" << "L(" << x << ")" << " = " << lx << endl;
    }
    system("pause");
}