Lab 2

Create a calculator to work with hexadecimal numbers.

Begin with a byte value of type uint8_t.

Use scanf() to read one line at a time from standard input.

Each line consists of a command and an integer argument. Each command operates on the byte value. Arguments are in hexadecimal.

Command	Action
set	Sets the current byte value to the argument
and	Bitwise AND the current byte value with the argument
or	Bitwise OR the current byte value with the argument
xor	Bitwise Exclusive OR the current byte value with the argument
shr	Shift the current byte value right by the argument
shl	Shift the current byte value left by the argument

After reading a line, your calculator should output the command and argument followed by "=>" and the new byte value.

For example,

INPUT: set 4
OUTPUT: set 4 => 4
INPUT: shr 1
OUTPUT: shr 1 => 2

A longer example can be found in the files lab02.input and lab02.output.

Tips

You can automate your testing by redirecting input from a file, rather than typing it in one line at a time, e.g.
```
$ ./calculator < lab02.input
```
You can save the output of your program by redirecting its output, e.g.
```
$ ./calculator < lab02.input > lab02.test
```
The UNIX diff command can tell you if one file is different from another, e.g.
```
$ diff lab02.output lab02.test
2c2
< shl 1 => 2
---
> shl 1 => 3
```