collision troubles

/*this struct is used to store the variables for both the enemy squares and the projectile objects:*/
typedef struct
{
	float xpos;    //x,y position of the object
	float ypos;
	float radius;  //used for sphere collision detection
	bool active;   //if true, draws the object.
	float xsize;   //dimensions of the object
	float ysize;
	float angle2;  //angle of movement, not used yet
}BoundingSphere;

BoundingSphere bullet[5];   //creates 5 instances of each
BoundingSphere enemies[5];

/*in my init() function, I set the values of the bullet and enemy object structs */
for (int i = 0; i < 5; i++)
		{
			bullet.active = false;
			bullet.xpos = 0; 
			bullet.ypos = 0;
			bullet.radius = 2.021/2;
			bullet.xsize = 1.2;
			bullet.ysize = 1.2;
			bullet.angle2 = 0;
		}

		for (int i = 0; i < 5; i++)
		{
			enemies.active = true;
			enemies.xpos = i*5; 
			enemies.ypos = 0;
			enemies.radius = 4.021/2;
			enemies.xsize = 2;
			enemies.ysize = 2;
			enemies.angle2 = 0;
		}

/*and collision detection function between the enemy objects and the bullets*/
void collisionDetect2(BoundingSphere bullet[], BoundingSphere enemies[])
{
	float dist2[5]; //distance between projectile and enemy object

    for(int i = 0; i < 5; i++)
	{
        dist2 = sqrt(((bullet.xpos-enemies.xpos)*(bullet.xpos-enemies.xpos))+((bullet.ypos-enemies.ypos)*(bullet.ypos-enemies.ypos)));
        
		if (dist2 < (bullet.radius + enemies.radius))
            {
                enemies.active = false;	
                printf("Collide\n"); 
		bullet.active = false;
			}
	}
	glutPostRedisplay();
}