Chapter 2.1, Problem 2.5PP

A.

Program Plan Intro

Byte ordering:

• Some machines decide to store the objects in memory ordered from least significant byte to most, while other machines store them from most to least.
• The byte ordering are made by the two ways:
  • Little Endian
    • In little Endian, the least significant byte comes first.
  • Big Endian
    • In big Endian, the most significant byte comes first.

Example:

The example for find the little-endian and big-endian for hexadecimal value is shown below:

Here assume that the hexadecimal value is “0x13244860”. Then address range for given ordering byte is “0x200” through “0x203”.

Big Endian for given hexadecimal value is

0x200	0x201	0x202	0x203
13	24	48	60

Little Endian for given hexadecimal value is

0x200	0x201	0x202	0x203
60	48	24	13

From the given question, the function definition for “show_bytes” is

void show_bytes(byte_pointer start, size_t len) {

int i;

for (i = 0; i < len; i++)

printf(" %.2x ", start[i]);

printf(“\n”);

}

The function “show_bytes” is used to show the address of a sequence of bytes indicated a byte pointer and a byte length.

B.

Program Plan Intro

Byte ordering:

• Some machines decide to store the objects in memory ordered from least significant byte to most, while other machines store them from most to least.
• The byte ordering are made by the two ways:
  • Little Endian
    • In little Endian, the least significant byte comes first.
  • Big Endian
    • In big Endian, the most significant byte comes first.

Example:

The example for find the little-endian and big-endian for hexadecimal value is shown below:

Here assume that the hexadecimal value is “0x13244860”. Then address range for given ordering byte is “0x200” through “0x203”.

Big Endian for given hexadecimal value is

0x200	0x201	0x202	0x203
13	24	48	60

Little Endian for given hexadecimal value is

0x200	0x201	0x202	0x203
60	48	24	13

From the given question, the function definition for “show_bytes” is

void show_bytes(byte_pointer start, size_t len) {

int i;

for (i = 0; i < len; i++)

printf(" %.2x ", start[i]);

printf(“\n”);

}

The function “show_bytes” is used to show the address of a sequence of bytes indicated a byte pointer and a byte length.

C.

Program Plan Intro

Byte ordering:

• Some machines decide to store the objects in memory ordered from least significant byte to most, while other machines store them from most to least.
• The byte ordering are made by the two ways:
  • Little Endian
    • In little Endian, the least significant byte comes first.
  • Big Endian
    • In big Endian, the most significant byte comes first.

Example:

The example for find the little-endian and big-endian for hexadecimal value is shown below:

Here assume that the hexadecimal value is “0x13244860”. Then address range for given ordering byte is “0x200” through “0x203”.

Big Endian for given hexadecimal value is

0x200	0x201	0x202	0x203
13	24	48	60

Little Endian for given hexadecimal value is

0x200	0x201	0x202	0x203
60	48	24	13

From the given question, the function definition for “show_bytes” is

void show_bytes(byte_pointer start, size_t len) {

int i;

for (i = 0; i < len; i++)

printf(" %.2x ", start[i]);

printf(“\n”);

}

The function “show_bytes” is used to show the address of a sequence of bytes indicated a byte pointer and a byte length.