HI to all .may be you all are asked to calculate the value of a polynomial at a given x.for eg let y=f(x)=1+2*x + 3*x*x .Just stay aside your regular technique to do this and try to understand this.May be you will find this useful.

This is another way to calculate the value at a given x.This solution is called HORNER's rule.no limit on the degree of polynomial

a0 + x0 *(a1 +x0*(a2+x0*(a3+x0*a4)))

as you can see it is a recursive function.

**Search google for better defination of horner rule**This is another way to calculate the value at a given x.This solution is called HORNER's rule.no limit on the degree of polynomial

a0 + x0 *(a1 +x0*(a2+x0*(a3+x0*a4)))

as you can see it is a recursive function.

Code: cpp

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;

}