HORNER rule to calculate value of a polynomial in C

int horner_rule(int poly[],int n,int x,int i){
    if(i==n)
    return poly[i];
    else
    return poly[i]+x*horner_rule(poly,n,x,i+1);
}
/*for equ like 2*x
*poly[]={0,2};
*/
int poly[]={1,2,3};// polynomial in the form 1+2*x+3*x*x....
int x0;
printf("enter value at which you want to calculate this polynomial :");
scanf("%d",&x0);
printf("%d",horner_rule(poly,(sizeof(poly))/sizeof(poly[0])-1,x0,0));
return 0;
}