Question

CS 238 – Assembly Language Programming

Fall 2019

Assignment 1

(Due: September 10, 2019)

Submission Instructions: Online submissions on Blackboard are preferred. Feel free to edit this Word document to insert your answers. Multiple online submissions on Blackboard are allowed, but only the last online submission made by the midnight of September 10 will be graded. Alternatively, a paper submission is possible, but it needs to be done in class on September 10.

1. Data can be interpreted as required by the programmer. Depending upon context, a number can be interpreted as a signed integer or a positive unsigned integer.

a) [4 marks] Provide the result of the following sum using Hexadecimal addition

0xFEB + 0x00A =?

b) [2 marks each] In this problem 0xFEB can be interpreted as an unsigned positive integer, or the 16s complement representation of a signed integer.

i. Provide the unsigned decimal interpretation of 0xFEB:

ii. Provide the unsigned decimal interpretation of the result of 0xFEB + 0x00A:

iii. Provide the signed decimal interpretation of 0xFEB:

iiii. Provide the signed decimal interpretation of the result of 0xFEB + 0x00A:

2. [5 marks each] Subtracting a larger number from a smaller number can be formulated as adding the complement of the larger number to the smaller number. Provide solutions for the following problems and show your steps.

a) Perform 16s complement subtraction of the following problem. Convert the result back and provide the resultant signed hexadecimal value: (show your steps)

0x123 – 0xABC =?

b) Perform 10s complement subtraction of the following problem. Convert the result back and provide the resultant signed decimal value: (show your steps)

567 – 4071 =?

3. [7 marks each] Provide the results and show your steps for the following problems.

a) Provide the result of the following hexadecimal multiplication: (show your steps)

0x3FA * 0x77 =?

b) Provide the result of the following binary division: (show your steps)

=?

Answer 1

1.

2.

a.

b.

3.