Fixed Point Method(Numerical Method) C++ Programming

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

#define f(x) x*x-6*x+8 // equation
#define g(x) (x*x+8)/6

int main()
{
float x0,x1,e=1;
cout<< "input the initial guess:";
cin>>x0;
while(e>0.005)
{
x1=g(x0);//working formula
e=fabs((x1-x0)/x1);
x0=x1;
}
cout<< "\nthe root of the equation ="<<x0;
return 0;
}

OUTPUT:

Here we can find the root of the equation x²-6x+8 by using fixed point iteration method.