vectors dot product 3d

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

typedef struct{
    double x;
    double y;
    double z;
}Vector3;


double vectDotProduct(Vector3 a, Vector3 b)
{
    return a.x * b.x + a.y * b.y + a.z * b.z;
}

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

    Vector3 tstV1 = {1.0,0.0,0.0};
    Vector3 tstV2 = {0.0,1.0,1.0};
    Vector3 tstV3 = {1.0,1.0,1.0};


    printf("%f\n",vectDotProduct(tstV1,tstV2));
    printf("%f\n",vectDotProduct(tstV1,tstV3));
    printf("%f\n",vectDotProduct(tstV2,tstV3));
    printf("\n");


return 0;
}

/*
output:

0.000000
1.000000
2.000000

*/