CS21b Introduction to Computing II
Number Representations
November 21, 2002 

Quiz:  Answer the following questions correctly.  Place your answers in a 1/2 sheet of paper and show all your solutions. You may use the decimal-binary-hexadecimal table.
  1. Convert the number 127 to binary. (2)
  2. Convert the binary number 0b11010011 to decimal. (2)
  3. Convert the hex number 0x8CF to binary and decimal.  (4)
  4. What is the sum of these two hex numbers? (Answer in hex) (4)
      0x2C
    +0x9E
  5. What is the result of the following operation assuming you are working with a 9-bit word length? (use 2's complement for subtraction) (4)
      (01010101 + 10110111) - 100001011 = ?
  6. Use 2's complement to find the difference of the following signed binary numbers: (4)
       01111101
    - 01100100

 

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