Program Specification:

Write a Java program that emulates a simple binary calculator:

Declare and initialize a String variable $($bitString$)$ to $""$

Declare and initialize an int variable $($resultSoFar$)$ to $0$

Display the current expression to the screen

Repeat the following until the $($Exit $)$ option is selected:

Display a menu which gives the user the choice of the following menu options:

$0$ Shift Left, Add $0$

$1$ Shift Left, Add $1$

$2->$ Exit, Evaluate

and uses a user validation loop to read their response into a String variable.

Note: You must repeatedly get the users response until it is exactly one of the characters $012$

If $($Exit$)$ was NOT selected:

$($a$)$ Update the $($bitString$)$ string:

Add the selected operation string to the end of $($bitString$)$ : $\text{'}\text{'}0"\text{'}$ or $+\text{'}"1"\text{'}$

$($b$)$ Display the current bitstring to the screen

$($c$)$ Update the numeric result of the bitstring $($resultSoFar$)$ :

resultSoFar $=2**$ resultSoFar $+0$ or resultSoFar $=2**$ resultSoFar $+1$

Display the entire expression with its result.

Grading:

$\backslash$table$[[$Performance Indicator,$1,2,3$