Two's Complement #1

Two's Complement #1

Representing negative integers in binary

Multiple Choice

In Computer Science what is meant by the 'unsigned integers'?

• The set of whole numbers 0,1,2,3,...

• The set of positive andnegative integers ...,-2, -1, 0, 1, 2,...

• Integers where we don't know if they are positive or negative

Multiple Select

Choose all the negative integers being represented using sign and magnitude notation.

• 1001

• 0101

• 0001

• 1111

Multiple Select

Identify two problems with using sign and magnitude representation for negative integers ...

• There are two representations for zero: 0000 and 1000

• Binary addition does not always give the correct answer

• There is a smaller upper and lower limit on the integers that can be represented

Multiple Choice

In two's complement representation, which bit represents a negative quantity?

• most significant bit

• least significant bit

• all the bits

• none of the bits

Multiple Choice

If a binary number is being stored in 6-bit two's complement, what is the place value of the most significant bit (msb)?

• -32

• -16

• -64

• -8

Multiple Choice

If the msb in a binary two's complement number represents a place value of -128, how many bits are in the number?

• 8

• 7

• 9

• 6

Multiple Choice

If a binary number is being stored in 4-bit two's complement, what is the place value of the most significant bit (msb)?

• -4

• -8

• -16

• +8

Multiple Choice

Which answer represents the correct steps to convert a denary number to binary two's complement

• Write down positive binary number

  flip the bits

  add 1

• Write down positive binary number

  flip the bits

  subtract 1

• Add 1

  Write down positive binary number

  flip the bits

Multiple Choice

Which answer shows the correct procedure for converting -29 to 6-bit binary two's complement

• 011101

  100010

  100011

• 011101

  011110

  100001

• 011110

  100001

  100010

• 11101

  00010

  00011