Regula falsi method

#include<stdio.h>
#include<conio.h>
#include<math.h>

#define   f(x)   (x*x*x) - x -4

int main()
{

float x0, x1, x2, f0, f1, f2, e;
int step = 1;
        up:
printf("\nEnter the range:\n");
scanf("%f%f", &x0, &x1);
printf("correct upto decimal places (0.001):\n");
scanf("%f", &e);

f0 = f(x0);
f1 = f(x1);

if( f0*f1 > 0.0)
{
  printf("Incorrect Initial Guesses.\n");
  goto up;
}

printf("\nStep\t\tx0\t\tx1\t\tx2\t\tf(x2)\n");
do
{
  x2 = x0 - (x0-x1) * f0/(f0-f1);
  f2 = f(x2);
  printf("%d\t\t%f\t%f\t%f\t%f\n",step, x0, x1, x2, f2);

  if(f0*f2 < 0)
  {
   x1 = x2;
   f1 = f2;
  }
  else
  {
   x0 = x2;
   f0 = f2;
  }
  step = step + 1;

}while(fabs(f2)>e);

printf("\nRoot is: %f", x2);
getch();
return 0;
}


OUTPUT :-