Yes.

  //----------------------------------------------
  void
  MVec3::normalize()
  {
    // calculate length.
    float len = sqrtf( x*x + y*y + z*z );
    
    // verify length is not zero.
    assert( len != 0.0f );
    if ( len == 0.0f )
      len = 1.0f;

    // divide by length.
    len = (1.0f / len);
    x *= len;
    y *= len;
    z *= len;
  }