Some of the most useful code you will develop this quarter is integer input/output (I/O) routines. This lab will require you to write loops to input ASCII characters and translate them into a number, and then translate a number into a sequence of characters for printing. You will also use bit operations to print the contents of registers as ones and zeroes.

Submit: malio.mal, README

Files:

• character i/o algorithms
• char_io.mal -- an example MAL program

Problem: Write a program that does two things:

a) Input a series of characters of the following format:
######+#####
That means that inputs can be variable-lengths! Convert the characters into the appropriate numbers, add them, and then print the result (convert the result BACK into a series of ASCII characters).
b) Input a character and store it in a register. Then print each bit of the character (8 bits).

Notes/Requirements:

Your integer input/output routines should be general - they should work for values up to 2^31 - 1. You will want to implement this as a loop. You may use any algorithms you wish to do this, but I suggest using the algorithms posted on the web page.

Collaboration with other students is allowed on this lab assignment! Make SURE you give other students and tutors credit for any help you receive and any code you develop together. Even if you develop some code with someone else and give credit, it still must be your own! This means if you can't write it, you can't use it! Give credit to any help you receive. Rewrite all your code "in your own words" to guarantee that it really is yours. And give credit. Give credit.

Evaluation: your lab tutor will assign one of following grades: check +, check, check -, 0

• For a 0, do nothing.
• For a X-, you will need to submit a MAL program which inputs numbers and adds them correctly, then outputs them correctly. You will get a X- for any of the following:
  • Your program is not general - it works for most inputs but not all.
  • You do not implement the bit printing part of the lab.
  • Bad or no README. See the lab manual for how to make a good README.
  • Each use of puti or geti in this assignment will drop your grade one check-point (X+ to X, X to X-) down to a minimum of 0.
• For a X, you will need to submit a fully functional program up to the specifications listed in the program description.
• For a X+, you will need to submit a program worthy of a check, plus you will need to implement the following features:
  • Instead of just handling a '+' for all inputs, also be ready to handle '-', '/', and '*'.
  • Do bitwise printing for both 8-bit characters and 32-bit integers. You can implement the interface for that in any way you wish (ie allow the user a choice of which to do OR do one, then the other, etc).

Happy Coding!
-cliff.

Graders: Here's a grading template!