///////    Vector inner product    ///////
#include <iostream.h>

int inner(const int *a, const int *b, int n)
{       int sum=0;
        while (n-- > 0) sum += *a++ * *b++;
        return(sum);
}

int main()
{ int x[]={0,2,5,-4};
  int y[]={0,1,1,2};
        cout << "inner product is " << inner(x,y,4) << endl;
        return(0);
}