Why are the only Numbers in computer coding 0 and 1?

Answer 1

Basically computer programming(aka coding) can be implemented in any of the following three ways:

1. Machine language (Machine code is the elemental language of computers, consisting of a stream of 0's and 1's)
2. Assembly language
3. High level language (Easy for us to write code due to resemblance with words in our language)

When thinking over ways to directly implement our general social language, what we see ? We don't have any ways to make a computer processor circuit recognize the letters or words like a,d,orange,$,{},@,+ etc. directly.

Looking from the basic viewpoint, we can have (most fundamentally) two levels that can be easily implemented through a circuit :

1. True or Yes or High ((for ex, when we have current [whatever be the magnitude of current, it is going to depend on how a processor is designed] at a point in circuit we will say it or recognize it arbitrarily as 1)) ..we can also use voltage or any other physical quantity instead of current
2. False or No or Low (when current or voltage is zero)

Now see next, we could then easily use Binary Arithmetic [ It has only two numbers or symbols 0(zero for true) and 1(one for false) ] to manipulate these binary numbers to represent any letters, symbols, quantity.

Also take a look over Octal numbers, Hex Numbers, Decimal Numbers, ASCII codes and relations among these representations from wiki.