#include "stdafx.h"
#include "iostream"
#include "fstream"
#include <string>
using namespace std;
struct Data
{
double x, y;
};
//Data przeslij(string a)
//{
// fstream plik;
// plik.open(a, ios::in);
// while (!plik.eof())
// {
//
// }
//}
double interpolate(Data f[], double xi, int n)
{
double result = 0;
for (int i = 0; i<n; i++)
{
double term = f[i].y;
for (int j = 0; j<n; j++)
{
if (j != i)
term = term*(xi - f[j].x) / double(f[i].x - f[j].x);
}
result += term;
}
return result;
}
int main()
{
Data f[] = { { -2,5 },{ -1,-2 },{ 0,4 },{ 1,-7 },{ 2,2 } };
cout << "Value of f(0) is : " << interpolate(f, -0.5, 5);
system("pause");
return 0;
}
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