The engineers assembled several logic gates
We describe here below a few such gates.
In all cases we always get the “perfect ones”
At front door irrespective of the input voltages
Which we give at the two back doors.
(We should remember that
“One” may mean a voltage say of “five” volts
And “zero” may mean a voltage of “ten” volts.
The electric voltages are low
And do not give you taste of any shock!)
In the first example the inputs at both back doors
Should only be “one” and “one”.
In the second case the inputs at the two back doors
Can be either “one” or “zero”
In the third case through the two back doors
We can send “zero and zero”
Or can send “one and zero”
There are many more cases
To ensure getting not only a “a perfect one”
But even a “perfect zero” through the front door!
There is a special “not” gate.
It has only one door at the back
And one door at the front.
If “one” goes in “zero” comes out
And if “zero” goes in “one” comes out!
The logic gates as you see are intelligent circuits
They imitate the situations
Which we encounter in life.
We say some times “I want both this and that”,
Some times “I want only this or that”
Some times the condition is “not this”
It is a most important condition
We can convert a “zero” into “one”
And a “one” into a “zero” as per our wish!
In further examples below
A and B are “inputting” doors
That lie on the back wall.
The outgoing zeroes and ones would pass
Through the door C at the front.
“You should complete both the works,
Then only I will pay you.”
It is realized in logic gate as below.
The “ones” (not “zeroes”) should enter at A and B.
Then only a “one” would comes out through C
“It is enough if you complete either work
Still I am ready to pay”
It is imitated thus in a logic circuit.
“If “one” enters in just through one back door
Either of the doors A or B
You can be sure of a “one”
Coming out of the front door C.
“You have not finished even one work
I warn you but still will pay.
But know this is the last such case”
The logic circuit imitates thus.
“Through the two back doors A and B
Only Boolean zeroes enter
But still a Boolean one comes out
Through C the door at the front.”
“I say sit down and you stand.
When I ask you to stand you sit.
What shall I do my silly little boy?”
This situation is imitated in the “not” logic gate.
“When zero comes in one goes out
When one comes in zero goes out”.