Is this class pointer correctly defined in this example?

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C++11

I am looking at one example on OpenGL college textbook. I think I find an issue here about pointer as this: class wcPt2D* vertRot inside function body:

class wcPt2D
{
public:
    GLfloat x, y;
}

//this is a rotate transformation
void rotatePolygo(wcPt2D* verts, GLint nVerts, wcPt2D pivPt, GLdouble theta)
{
   wcPt2D* vertRot; //question here: do we need to allocate the dynamic memory first?
   GLint k;

   for(k=0; k< nVerts; k++){
       vertsRot[k].x = pivPt.x + (verts[k].x - pivPt.x) * cos(theta)
                      -(verts[k].x - pivPt.y ) * sin(theta);
       vertsRot[k].y = pivtPt.y + (verts[k].x - pivPt.x) * sin(theta)
                      +(verts[k].y - pivPt.y) * cos(theta);
   }

   glBegin(GL_POLYGON);
      for(k=0; k < nVerts; k++)
         glVertex2f(vertsRot[k].x, vertsRot[k].y);
    
   glEnd;
   
}

I know in C++, struct is the same as class type. from my understanding,
vertRot is wcPt2D pointer and need to be allocated based on nVerts first, otherwise, this function will fail to compile.

I am not sure if I am right on this point. so posted here to check with gurus here.

What I have tried:

for these kind of struct pointers, I am very familiar.