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Why not take it one step further: You put two cat items and three mice items into a closed box with no way to inspect the interior. Once you have closed and sealed the box, you will be unable to determine the total number of items in the box at any given time, until you break the seal.
If Schrödinger had designed sucn an experiment, he probably would have suggested two large dog items and three kitten items - rumours are that he wasn't very much in favor of protecting cats from harm.
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Uh-oh! You're starting to sound like a systems architect now.. 
How do you know so much about swallows? Well, you have to know these things when you're a king, you know.
modified 31-Aug-21 21:01pm.
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"Pointers and memory addresses are a future topic Laugh | "
There are those that never ever get the concept of pointers. These people usually switch majors from programming to marketing. 
Fletcher Glenn
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I never understood the fuss about pointers, they always seemed pretty straightforward to me.
Trying to teach a 6 year old about hex or binary is probably pushing things a bit though
How do you know so much about swallows? Well, you have to know these things when you're a king, you know.
modified 31-Aug-21 21:01pm.
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You can tell him the story with a bucket a which has 2 liters in it ...
Maybe he got other talents like singing or crafting things. 
Press F1 for help or google it.
Greetings from Germany
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My son has a BS in Computer Science. Many years ago when we had that conversation it went like this:
Me: Let a=2 and let b=3. What's a + b?
Colin: 5. Get out of the way old man, I have an algorithm to debug!
The kid always was a quick study...
Like someone else wrote - memory addresses and pointers are probably a bit too advanced. Stick with a container appropriate to the age.
Contrary to popular belief, nobody owes you anything.
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rnbergren wrote: Ideas? I didn't get anywhere.
When I was first exposed to programming, I had the hardest time understanding how a computer new "what a is." One day, I just got it.
Here's what you do. Take two bowls, and label them "A" and "B" (actually label them, don't just say, let's call this bowl "A" and this bowl "B"!) Put 2 lemons (or apples, or whatever) in bowl A. Put 3 in bowl B. Ask your son how many lemons/apples/whatever are in both A and B. Then ask your son what A+B is.
Label a third empty bowl C. Ask your son to physically express "C = A + B" by moving the fruit from bowls A and B into C.
I'm sure he'll get it. Explaining all about memory address stuff is way to abstract without tangible, physical memnonics (or whatever the word is.)
Marc
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Yes, and if you use a mix of apples, lemons, oranges, etc. you can refer to it all as "fruit" and then go on to talk about class inheritance and so on... Brilliant!
- I would love to change the world, but they won’t give me the source code.
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Forogar wrote: es, and if you use a mix of apples, lemons, oranges, etc. you can refer to it all as "fruit" and then go on to talk about class inheritance and so on... Brilliant!
Hah! That is brilliant! I hadn't thought of that. 
Marc
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I should add, He isn't that young. He is really quite good at Science and Math. So logically speaking we weren't way off topic at all. Over 10
To err is human to really mess up you need a computer
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Does he know algebra?
What exactly would you like to explain?
Variables are an abstraction for a model that we use in math, programming and other things.
Talking about A and B allow us to think in general (abstract) terms.
I think that was astute for him to ask why not just add 2+3 together if he doesn't understand the need for the abstraction.
I agree with Mark's line of explanation, use something tangible.
To tie the entire argument together, where does the answer get stored?
If the equation is A+B=C, have a third bowl labeled C, place the bowls A and B inside of C.
How many oranges are in C.
A is still equal to 2
B is still equal to 3
C is now equal to 5
And no laws of physics had to be broken to magically produce 5 new oranges just to assign the answer to C.
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Just found where I discovered variables aged 8.. on page 58 of this[^].
How do you know so much about swallows? Well, you have to know these things when you're a king, you know.
modified 31-Aug-21 21:01pm.
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rnbergren wrote: Ideas?
Management track?
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Perhaps a DNA test ?
| "The difference between genius and stupidity is that genius has its limits." - Albert Einstein | | "As far as we know, our computer has never had an undetected error." - Weisert | | "If you are searching for perfection in others, then you seek disappointment. If you are seek perfection in yourself, then you will find failure." - Balboos HaGadol Mar 2010 |
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It might be time to try the Father Ted "small cow and far away cow" test.
It always gets me and if he passes it he's probably fine.
“That which can be asserted without evidence, can be dismissed without evidence.”
― Christopher Hitchens
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Perhaps you should put off this sort of discussion until after his third birthday. 
Will Rogers never met me.
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Looks like he could have a bright future in customer support.
".45 ACP - because shooting twice is just silly" - JSOP, 2010
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You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
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When you pry the gun from my cold dead hands, be careful - the barrel will be very hot. - JSOP, 2013
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When you go on to constant declarations, you may pick up some hints from the famous Xerox Fortran programming manual (in Fortran, constants are defined by DATA statements), to explain the rationale behind named constants:
The primary purpose of the DATA statement is to give names to constants;
instead of referring to PI as 3.141592653589797, at every appearance,
the variable PI can be given that value with a DATA statement, and
used instead of the longer form of the constant. This also simplifies
modifying the program, should the value of PI change.
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I would get two containers and label them a and b. Bowls, boxes, etc.
Then I would say something like: Every day I am going to count the number of your toys that are in the living room. I will write that number on a slip of paper and put it in bowl a. Your Mom will count the number of toys in your room and write that number down on a slip of paper and put it in bowl b.
So everyday I want to know the total. I could say add the number in bowl a to the number in bowl b but to make things simple I say a+b which means the same thing.
bleahy
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It's a developmental thing. I could not help my son when he was in first grade. It seemed he couldn't get anything. Then at 12 he got into a spot of bother and I took him to a night class I was taking. He sat at a computer next to me and said show me some C. I opened an IDE for him and showed him a couple of things, and went to my own work for the class. After a while he said look at this, and he ran a command line program he had written that prompted the user for a password, (hard coded), and did some small thing. He had never seen C code. He's a developer now.
Take heart and let the kid grow.
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Take two paper cups and a magic marker. On one write "A"; on the other, "B". Put two beans in "A" and three beans in "B". Ask your son how many beans are in A, how many in B, and how many added together.
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Not knowing for sure how old your son is.
Algebra is the best way to explain it.
Area = WxL
Programming is about abstracting one solution to solve many problems, just like Algebra.
The other way is to use coins. You enter how many quarters, nickels and dimes you have, and it tells you how much it is worth. Again static formula. I had 2yrs of BASIC programming before I learned ASSEMBLER and Realized that a variable was just a reference to a specific memory address. It was a cool day...
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What happens in the event that figure "A" is attracted to figure "B" and wants to get married, but figure "A" is already married to, say, figure "C," and figure "B" is engaged to figure "D"? But figure "A" can't keep his hands off of figure " B," because she's got such a great figure?
from M*A*S*H episode "Dear Dad"
Brent
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Start with
2 + _ = 5
What goes in the blank?
3
What if instead of using the blank I say
2 + @ = 5
What is the value of @?
3
What if instead of using the blank I say
2 + a = 5
What is the value of a?
3
What if I say:
_ + _ = 5
or _ + @ = 5
or a + b = 5
This forms a "Fact Family"
Plot the fact family on a piece of graph paper
hooked.
If they understand negative numbers (direction or debit/credit) make sure you graph some negative numbers as well.
Then worry about computer memory and the like.
A good analogy for computer memory/nicknames
Addresses/mailboxes on a street, but you say "Bobby's House" "Sally's House" etc.
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Hmmm...the concept of variables/memory locations.
OK.
His best friend's phone number.
"671-1375" isn't his best friend, but it using it will get him his best friend.
Not a perfect analogy, but might get him pointed in the right direction.
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