202201-midterm-1

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School

University of Victoria *

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230

Subject

Computer Science

Date

Dec 6, 2023

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pdf

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Uploaded by PresidentStrawSwan18

Page 1 of 10 CSC 230 Summer 2022 (A01: CRN 30207; A02: CRN 30208) Midterm #1: Thursday, 2 June 2022 Marking Key Students must check the number of pages in this examination paper before beginning to write, and report any discrepancy immediately. • All answers are to be written on this exam paper. • The exam is closed book. Other than the AVR reference booklet provided to you, no books or notes are permitted. • When answering questions, please do not detach any exam pages! • A basic calculator is permitted . Cellphones must be turned off. • Partial marks are available for the questions in sections B and C. • The total marks for this exam is 76. • There are ten (10) printed pages in this document, including this cover page. • We strongly recommend you read the entire exam through from beginning to end before starting on your answers. • Please have your UVic ID card available for inspection by an exam invigilator.

Page 2 of 10 Section A (36 marks): For each question in this section, place an X beside all answers that apply. Each question is worth three (3) marks. Partial marks are not given for incomplete answers . Remember: Hexadecimal numbers begin with 0x ; binary numbers begin with 0b ; octal numbers begin with 0 ; and all other numbers are decimal . All numbers are unsigned unless the question specifies otherwise. Question 1: The unsigned integer 0x345 can be represented as: _____ 0b010101000011 _____ 0b011100101 __X__ 0b001101000101 _____ 0575 _____ None of the above. Question 2: The unsigned integer 0b10100011 is equivalent to: __X__ 163 _____ 0xA1 _____ 147 _____ 0xA5 _____ None of the above. Question 3: The unsigned integer 0755 is equivalent to: _____ 0b1011101101 _____ 0x1DF _____ 0x1CD _____ 0b011101010101 __X__ None of the above.

Page 3 of 10 Question 4: The decimal number -27 represented as a 10-bit two’s complement number is equivalent to: _____ 0b1000011011 _____ 0b1111100100 __X__ 0b1111100101 _____ 0b1000000101 _____ None of the above. Question 5: The six-bit two’s complement number 0b101111 is equivalent to: _____ 0b00101111 as an eight-bit two’s complement number. _____ -31 _____ -15 _____ -29 __X__ None of the above. Question 6: If we consider I/O port B, then: _____ we set the data-direction for each bit (input or output) by an appropriate value stored in the PINB and PORTB registers. __X__ we set the data-direction for each bit (input or output) by an appropriate value stored in the DDRB register. __X__ we read values from the port by reading from the PINB register. _____ we read values form the port by reading from the PORTB register. _____ None of the above.

Page 4 of 10 Question 7: The largest positive value that can be represented using a five-bit two’s complement number is: _____ 0b10000 __X__ 0b01111 _____ 64 _____ 31 _____ None of the above. Question 8: The most negative value that can be represented using a six-bit two’s complement number is: __X__ 0b100000 _____ 0b111111 _____ -31 __X__ -32 _____ None of the above. Question 9: The fetch-decode-execute cycle : _____ Describes the steps taken when the assembler generates a sequence of fet , dec , and exe instructions that appear in a loop. __X__ Permits the AVR mega2560 to fetch and decode an instruction in one cycle, and to execute it in the next cycle(s). _____ Permits the AVR mega2560 to fetch, decode, and execute an instruction in one cycle. _____ Is another name for the meaning of the brne instruction . _____ None of the above.

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