Regula-Falsi

#include<stdio.h>
#include<conio.h>
#include<math.h>
#define F(x) x*x+x-2
int main ()
{
	float x,x1,x2,x0,fx1,fx2,fx0,e=0.0001,c=0,a=1.0;
   clrscr();
   printf("Enter x1 and x2: ");
   scanf("%f %f",&x1,&x2);
   //xm=(x1+x2)/2;
   while(a>e)
   {
		//xm=(x1+x2)/2;
      x=x1;
      fx1=F(x);
      x=x2;
      fx2=F(x);
      x0=x1-(fx1*(x2-x1)/(fx2-fx1));
      x=x0;
      fx0=F(x);

      if ((fx0*fx1)<0)
      {
			fx2=fx0;
	 		x2=x0;
      }
      else
      {
			fx1=fx0;
	 		x1=x0;
      }
      a=fabs((x2-x1)/x2);
      c++;

   }
   printf("\n\nItteration: %.0f times.\nAns: %f",c,x0);
   getch();
   return 0;
}