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To solve Assembly programs, it is often useful to first construct an algorithm

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General Requirements:

 

a) To solve Assembly programs, it is often useful to first construct an algorithm or a Java program which provides the basic idea of what needs to be accomplished and in what order. Based on your limited understanding of assembly, these programs AT THIS TIME should be limited to using:

a. addition and/or subtraction

b. contains just a main method

c. has only global static variables (no local variables)

You cannot use these (because you do not know how to create these yet): a. Local variables

b. IF/SWITCH statements c. Loops

d. Multiplication, division, modulus

e. Math library functions

b) Your algorithm can be written as pseudo-code, Java or C. Select whatever form is most comfortable for you.

c) You must comment your assembly programs by describing the logic of the program. The algorithm or code from your program is often sufficient, but you might need to add more detail.

d) A copy of your program or pseudo-code algorithm must also be included as a COMMENT at the end of the program.

e) The IRVINE library will be used in all the programs. No other libraries can be used.

f) Only assembly operation instructions covered to Section 4.2 on Chapter 4 + the Irvine library functions mentioned to date in the labs and course examples can be used for this assignment. (Details on how to use any of the Irvine Library functions can be found in Section 5.4)

 

Useful Information:

 

To collect an unsigned integer value from a user, you need to first ask a question and then collect the response. To ask a question in assembly, you can use the WriteString library function to print a string by placing the offset of the string in the EDX register and then call the function. To collect the unsigned integer value, use the ReadDec library function. The value is returned in the eax register. To collect a signed integer, the ReadInt library function is used instead; again the answer is always returned in the eax register. For more details, you can look at the library functions in chapter 5, section 4.

 

 

 

Questions: Produce both Assembly programs and Java/Pseudo-code for all

 

A) [20 marks]

Write a program that collects four signed values from the user representing A, B, C & D. Use unique prompts for each variable. Store each value in one of four WORD variables appropriate for these 4 variables. At this point, clear the value in the EAX register by loading the value -1.

 

Next calculate the following two expressions and store the results in two WORD variables – result1 and result2.

RESULT1 = 2A – B + 6C – 3D RESULT1 = 5D + 3A – 2B + C

 

Finally, report the answers something like the following:

Sample output.  Note that missing part is the collection of the variables A,B, C, & D as well as the

second equations output.

 

B) [30 marks]

Read 5 SIGNED numbers into an array of SBYTE values using the prompt “Please enter 5 signed integers in the range of -128 to 127: “. Use direct offset operands to store each of the numbers into the array. After the numbers have been collected from the user and stored in the array, perform the following calculations, and report the results as indicated:

a) add the numbers in the array together and report the total – which may be larger than a BYTE;

b) add the first, third, and fifth numbers together and then subtract the second and fourth values from that sum.  Again, the result might exceed a BYTE.

 

For each of these calculations, print the result as a SIGNED integer, UNSIGNED integer, a HEX value, and a BINARY value using appropriate text to label the output. All printed results are 32-bit values.

 

Both the input and output must be professional looking.

 

 

 

Submission, demonstrating, and grading:

 

For each of the programs:

i. The Java/pseudocode programs can be used as the comments for the assembly code along with other descriptions as required. Also, add the Java or pseudocode at the bottom as one large COMMENT section.

ii. The header must include your name, assignment number, question number, and program description.

 

Upload all your .asm files for each of the programs to the CMS.

 

 

All programs must be fully commented using the two-column approach discussed in class and shown throughout the textbook in the code examples.

 

Comment the logic – not the instructions. In other words, comment “Collecting the first number” and not a line-by-line description of each assembly instruction to accomplish this task. Typically, one line of comment describes the logic for several lines of assembly. Failure to comment the code properly or to format like the code in the textbook will result in a penalty of up to 25%.

 

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