$1$ Description of Task

As part of this assignment, you will be responsible for conversions between number representations and

bitwise manipulations. The programming assignment should be developed in Java, and your classes

must reside in the package cs$250.$hw$1$

Your program will be provided with $3$ arguments at the command line. You are required to perform a

set of operations over these arguments. These operations have been broken up into tasks: the points

distribution for each task and the restrictions $($and accompanying deductions$)$ are specified in the

grading section of this assignment.

Command line execution: java cs$250.$hw$1.$Operations $0b1010110010x0x1590b0x^{\text{'}\text{'}}$ Task $3$:

Error checking:

A binary number should not contain anything other than a $0$ or $1.$

A decimal number should only comprise digits $0$ through $9.$

A hexadecimal number contains digits $0$ through $9,$ and letter A through $F$ either in lowercase

or uppercase.

Print true or false for every input and terminate if any are false. You should print all $3$ regardless of any

input being invalid.

Note: Task $4-8$ can be completed using built in java methods. Only use them to check your

answer. If you violate these restrictions, points will be deducted $($up to $100\%)$ as outlined in

the deductions section. You may use these built in java methods only to validate the

correctness of your own implementation.

Task $4$:

Convert each of the input numbers into the corresponding number in other numbering systems. For

example, if the number is in binary, you should convert that number into their corresponding

representations in the decimal and hexadecimal numbering systems.

Recall: The $n^{th}$ digit from the right in base $b$ is $b^{n-1}$

Built in java function that you should not use: Integer.parseInt $($num$,$ radix$)$;

Task $5$:

For every number specified at the command line, you will compute that number's negative

representation in $1\text{'}$s complement. For example, if we give you $5$ you will return $-5$ represented in $1\text{'}$s

complement. This will require you to first convert each of the input numbers into binary.

Recall: $1\text{'}$s complement is accomplished by flipping each bit in the binary representation i$.$e$.$ a $1$ becomes

a $0,$ and a $0$ becomes a $1.$

Built in java function that you should not use: $$ num

Task $6$:

For every number specified at the command line, you will compute that number's negative

representation in $2\text{'}$s complement. For example, if we give you $5$ you will return $-5$ represented in $2\text{'}$s

complement. This will require you to first convert every number into binary. You can ignore any potential

overflow, meaning if we give you a $4-$bit bitstring, you should return a $4-$bit bitstring.

Recall: $2\text{'}$s comp is accomplished by applying $1\text{'}$s comp then adding $1.$

Built in java function that you should not use: $$ num $+1$

Task $7$:

Compute the bitwise OR$,$ AND, and XOR of the $3$ numbers. This will require you to first convert every

number into binary. This will require that you have equal length bitstrings. Recall that front$-$padding

with $0\text{'}$s does not change the value of an unsigned binary number, so you can front$-$pad all binary

bitstrings with $0$ before operating such that all $3$ binary numbers are the same length as the longest

one. Recall:

OR: If either of the values is a $1$ the result is a $1$ otherwise it is a $0.$

AND: If both values are $1$ the result is $1$ otherwise it is a $0.$

XOR: If either of the values are $1$ and they are not both $1$ the value is a $1$ otherwise it is a $0.$

Built in java function that you should not use: num$1|$ num$2,$ num$1$ & num$2,$ num$1^$ num$2$

Task $8$:

Compute the bitwise left and right shift of the $3$ numbers for $2$ shifts. This will require you to first convert

every number into binary.

Recall:

Left Shift: This is accomplished by appending an x number of $0\text{'}$s$.$ The output will be longer

than the input.

Right Shift: Accomplished by moving each digit to the right $x$ times. The output binary string

will be shorter than the input. See lecture slides

Built in java function that you should not use: num num $1>>2$

Deduction:

There is a $7\mathrm{.}5-$point deduction $($i$.$e$.,$ you will have a zero on the assignment$)$ if you:

$(1)$ Build a GUI

Use of the following methods will result in a $100\%$ deduction of the task points where used:

$(1)$ Integer.parse

$(2)$ Integer.toHexString

$(3)$ Integer.toBinaryString

$(4)$ Built in bitwise operations $($~$,^,|,$ &

a$.$ Note: Logical operations are allowed $(!,||,$ &&$,$ etc.$)$

A $100\%$ deduction will occur from using any of the methods in this list $($and all their overloaded

variants$).$ Please note that $1)$ Integer.parse refers to Integer.parseInt. An additional set of overloaded

methods has been included to the deductions list from the Integer class: Integer.value