Question $3$

Using the Little Man's Computer, write a program to implement the push and pop operation.

The program will ask the user to positive numbers one at a time which will be pushed into the

stack. The user can choose to end input by keying in a negative value. At the end, pop the stack

one element at a time and print out the values until the stack is empty. You can assume that the

bottom of the stack is at location $99$ and it grows toward smaller memory locations.

$($a$)$ Show your codes and describe how your program works.

$($b$)$ Evaluate the quality of your program by using various test cases. Support your answers

using appropriate screenshots of the tests.