#15 Representing numbers and characters

1. Which of these data types could never be used to somehow represent the mathematical concept of pi () in one primitive variable? You may assume its value must be given to at least 2 decimal places.

• A. Character
• B. Integer
• C. Real
• D. String

2. What is the effect of typecasting a character to an integer?

• A. Numbers become numeric, e.g. '7' becomes 7, whereas non-numbers get set to 0
• B. All characters have to be represented as real numbers when converted as there would not be enough bits if they were stored as integers
• C. It will reveal the underlying numeric code assigned to it in the chosen character set
• Option 4

3. What is stored in a character variable?

• A. Precisely 1 character
• B. 0 or 1 characters
• C. At least 1 character
• D. A minimum of 0 characters

4. Convert the unsigned binary number 1101 to denary

• A. 1101
• B. 12
• C. 13
• D. 11

5. Convert the number 54 to 8-bit unsigned binary

• A. 00111011
• B. 00011011
• C. 00111000
• D. 00110110

6. What are the place values of unsigned binary numbers?

• A. Ascending powers of 2 working left to right
• B. Ascending powers of 2 working right to left
• C. Descending powers of 2 working right to left
• D. Multiples of 2 working right to left

7. Add the following two unsigned binary numbers: 1001+ 0111

• A. 1111 (overflow has occurred)
• 11111 (underflow has occurred)
• 10000 (underflow has occurred)
• 10000 (overflow has occurred)

8. Add the following three unsigned binary numbers: 10011001+00110011+ 00011110

• A. 11001010
• B. 01010101
• C. 11101010
• D. 10101010 (overflow has occurred)

9. Which calculation produces the result 99?

• A. 01010001 + 00010010
• B. 10000001+00101000
• C. 0011100000010110
• D. 0101000100010010

10. Which of these is the hexadecimal representation of 1011110?

• A. 5E
• B. B6
• C. 6E
• D. B5