#include <stdio.h>
#include <math.h>

int main () {

  float x[3] = {1.0, 2.0, 3.0}; 
  float y[3] = {2.0, 3.0, 4.0};;
  float dotprod;
  int i; 

  for ( i = 0, dotprod=0.0; i < 3; i++ ){
 
     dotprod += x[i] * y[i];
  }

  printf("dot product of x and y is %7.4f\n", sqrt(dotprod) );

   return 0;
}