#include <stdio.h>

extern void addvector(double *u,double *v,double *w,int len);

#define LENGTH 7

double x[LENGTH];
double y[LENGTH];
double z[LENGTH];

int main(int argc,char **argv)
{
  int i;

  for (i = 0;i < LENGTH;++i) x[i] = random() * 0.000001;
  for (i = 0;i < LENGTH;++i) y[i] = random() * 0.000001;
  for (i = 0;i < LENGTH;++i) printf("%lf ",x[i]); printf("\n");
  for (i = 0;i < LENGTH;++i) printf("%lf ",y[i]); printf("\n");
  for (i = 0;i < LENGTH;++i) printf("%lf ",x[i] + y[i]); printf("\n");

  addvector(z,x,y,LENGTH);

  for (i = 0;i < LENGTH;++i) printf("%lf ",x[i]); printf("\n");
  for (i = 0;i < LENGTH;++i) printf("%lf ",y[i]); printf("\n");
  for (i = 0;i < LENGTH;++i) printf("%lf ",z[i]); printf("\n");

  return 0;
}