Newton-Raphson Mehtod(Numerical Method) C++ Programming

#include<iostream>
#include<math.h>
using namespace std;

#define f(x) 3*x*x-6*x+2 //equation
#define g(x) 6*x-6 // derivative of the equation

int main()
{
float xi,x,fi,gi,f=1,e=1;
cout<< "enter the initial guess x0:";
cin>>xi;
while(e>=0.0001 && f!=0)
{
fi=f(xi);
gi=g(xi);
x=xi-(fi/gi); //working formula
f=f(x);
e=fabs((x-xi)/x);
xi=x;
}
cout<< "\n the root of the equation="<<x;
return 0;
}

OUTPUT:

here we can find the root of equation 3x²-6x+2 by using Newton-Raphson Method