QUESTION THREE

This problem simulates the addressing system on a computer disc fite. The diagram represents a disc This podinto $4$ quadrants, each quadrant' divided into $3$ tracks and each track divided into a number of locations

In these locations are alphabetic characters. These represent the contents of the location not the addresses of the locations. The addresses are given by the formula

QUADRANT $/$ TRACK $/$ LOCATION

The quadrants are $\text{'}A\text{'}\text{'}B\text{'}\text{'}C\text{'}D\text{'}$ in a clockwise direction. The tracks are $\text{'}A\text{'}\text{'}B\text{'}\text{'}$C$\text{'}$ from outside to inside

Thus the expression of

QUADRANT$/$TRACK$/$LOCATION A A A

refers to the ist quadrant and within it to the first track and within it to the first location.

Looking at the diagram you will see this contains the letter H$-$t

In order to group the Q T L symbols into a coherent entry it will be represented as A $($A$.$A$)$

First the Quadrant

Then the Track

Then the Location

Given the reference

$D(C,E)$

you will find the answer in

the fourth Quadrant on the third Track

in the fifth Location moving clockwise.

It is the letter $D.$

WRAP$-$AROUND

The principle of wrap$-$around means returning to the beginning of a series when the end has been reached and starting all over again

Using this we can refer to our guadrants as A$-$B$-$C$-$D and then staring at A re$-$name it E$,$ B becomes F$,$ C becomes G$,$ D becomes H$,$ E which started ass A now becomes I and so on through the alphabet.

A becoming synonymous with E$,$ I, M$,$ O ate

B bocoming synonymous with F$,$ J$,$ N$,$ R ele

The same applies to the tracks.

The localions within the brecks may be ireated in the same way.