Horner's Method Program

#include 
#include 
#include 
#define f(x) 3*x*x - 6*x + 2
int main()
{
    int n;
    float x0,a[50],b[50];
    a[0]=2;
    a[1]=-6;
    a[2]=3;
    clrscr();
    n=2;
    //printf("Enter Degree of Polynomial : ");
    //scanf("%d", &n);
    printf("Enter the value at which polynomial is to be evaluated : ");
    scanf("%f", &x0);
    b[n] = a[n];
    while(n>0){
	b[n-1] = a[n-1]+b[n]*x0;
	n--;
    }
    printf("Value of polynomial f(%0.4f)=%0.4f",x0,b[0]);
    getch();
    return 0;
}