#ifndef VECTOR_H 
#define VECTOR_H 

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

typedef struct {
   float a;
   float b;
} vector;

#define NUM_VECTORS 9

vector* make_vector(float a, float b);
float x_coordinate(vector *v);
float y_coordinate(vector *v);
vector* mul(vector *v, float r);
vector* sum(vector *v, float a, float b);

#endif