class complex
''mr and mi are private now
''shoot be a choice able for public
  dim mr , mi
''default parameters are nice to
''sub complex a = 0 , b = 0
  sub complex
    mr = 0
    mi = 0
  end sub
  sub complex a , b   
    mr = a
    mi = b
  end sub
''if mr and mi are public
''these two functions are not nesery
  function r()
    r = mr
  end function 
  function i()
    i = mi
  end function

''THIS is what i want to do :

''  function add( in as complex ) as complex
''    add = new complex this::mr + in::mr _
''    , this::mi + in::mi
''  end function

''or even better :

''  operator +=( in as complex ) as complex
''    return complex this::mr + in::mr _
''    , this::mi + in::mi
''  end operator

end class  
 

dim a() = { 0,1,2,3,4,5 }
''and
dim m(,) ={{0,1},{2,3}}
 

''first we create some objects
obj1$ = v3d$( 1 , 2 , 3 )
obj2$ = v3d$( 4 , 5 , 6 )
''then we print them
print "vectors :"
print " a = " ; obj1$ 
print " b = " ; obj2$
''then we do some OOP math
print "adding :"
print "a + b = " ; addv3d$( obj1$ , obj2$ )
print "subtracting :"
print "a - b = " ; subv3d$( obj1$ , obj2$ )
print "lenght :
print "| a | = " ; lenghtv3d( obj1$ )
print "| b | = " ; lenghtv3d( obj2$ )

end
''special class functions
function v3d$( x , y , z )
''constructor of a v3d object$
  v3d$ = str$( x ) + " " + str$( y ) + " " + str$( z )
end function
function xv3d( a$ )
''property
  xv3d = val( word$( a$ , 1 ) )
end function
function yv3d( a$ )
''property
  yv3d = val( word$( a$ , 2 ) )
end function
function zv3d( a$ )
''property
  zv3d = val( word$( a$ , 3 ) )
end function
function addv3d$( a$ , b$ )
''first get property's
  ax = xv3d( a$ )
  ay = yv3d( a$ )
  az = zv3d( a$ )
  bx = xv3d( b$ )
  by = yv3d( b$ )
  bz = zv3d( b$ )
''use constructor to get new object$
  addv3d$ = v3d$( ax + bx , ay + by , az + bz )
end function
function subv3d$( a$ , b$ )
''first get property's
  ax = xv3d( a$ )
  ay = yv3d( a$ )
  az = zv3d( a$ )
  bx = xv3d( b$ )
  by = yv3d( b$ )
  bz = zv3d( b$ )
''use constructor to get new object$
  subv3d$ = v3d$( ax - bx , ay - by , az - bz )
end function
function lenghtv3d( a$ )
  x = val( word$( a$ , 1 ) )
  y = val( word$( a$ , 2 ) )
  z = val( word$( a$ , 3 ) )
  lenghtv3d = sqr( x ^ 2 + y ^ 2 + z ^ 2 )
end function
''genaral class functions
''these work slow
''so i dont think of using them
''NOT TESTED JET
function setprop$( clas$ , object$ , prop$ , val$ )
  pointer = 0
  out$ = ""
  while pointer < 20 _
  and word$( clas$ , pointer ) <> prop$ 
    if word$( clas$ , pointer ) = prop$ then
      out$ = out$ + " " + val$
    else
      out$ = out$ + " " + word$( object$ , pointer )
    end if
    pointer = pointer + 1
  wend
  setprop$ = out$
end function
function getprop$( clas$ , object$ , prop$ )
  pointer = 0
  out$ = "error"
  while pointer < 20 _
  and word$( clas$ , pointer ) <> prop$ 
    if word$( clas$ , pointer ) = prop$ then
      out$ = word$( object$ , pointer )
    end if
    pointer = pointer + 1
  wend
  setprop$ = out$
end function