Prod escalar

#include <stdio.h>

#define N 15

int main(void)
{
  int i;
  double x[]={1.0,2.0,3.0}, y[]={4.0,5.0,6.0}, xy;

  for (i=0;i<3;i++)
    {
      xy+=x[i]*y[i];
    }

  printf("x escalar y = %lf \n",xy);

  return 0;
}