Secant Method Program

#include
#include
#include
#define f(x) 2*x*x+4*x-10
#define E 0.0001
int main(){
	int count=0;
	float x0, x1, x2, f1, f2, err;
	clrscr();
	printf("Enter value of x0: ");
	scanf("%f", &x0);
	printf("Enter value of x1: ");
	scanf("%f", &x1);
	printf("FirstValue\tFx\tSecondValue\tFx\n");
	do{
		count++;
		f1=f(x0);
		f2=f(x1);
		x2=x1-(((x1-x0)*f2)/(f2-f1));
	printf("%0.4f\t\t%0.4f\t\t%0.4f\t\t%0.4f\n", x0, f1, x1, f2);
	err=fabs((x2-x1)/x2);
	x0=x1;
	x1=x2;
	}while(err>E);
	printf("\nRoot: %f", x2);
	printf("\nSteps: %d", count);
	getch();
	return 0;
}