Big Data next day homework

1. What is the representation of negative numbers and why is it so designed?

A: Negative numbers use a positive complement way to express, using the complement to indicate negative numbers after the CPU for the calculation of subtraction can also be solved by adding operations.

How is 2.-128 stored in memory? The calculation process?

For:

125 01111101

-125 10000011

126 01111110

-126 10000010

127 01111111

-127 10000001

128 10000000 (cannot be represented as a positive number because the highest is a sign bit)

-128 10000000

3. If the byte represents no 11111111, what is its true data?

A: 1. Because the highest bit sign bit is 1, first determine that the byte represents a negative number

2. Convert it to a positive number (the last 1 is unchanged and the other bits are reversed) to get the result

00000001 the number of positive expressions is 1

3. Since the number is negative, the decimal value of its positive number is 1 to infer that the decimal of that digit is-1

4. Do positive and negative numbers support the complement approach?

A: Positive numbers do not have the concept of complement, only a negative support complement, can also be understood as a positive complement is its own

5. Is the positive number minus one negation?

Take the number 3 example:

3 00000011

-3 11111101

-4 11111100 (minus 1)

00000011 (Take reverse)

It is proved that the positive number can be obtained by reducing the negative number by one inverse method.

Big Data next day homework