Compile and run the sample code that uses show_bytes (file show-bytes. c) on different machines to which you have access. Determine the byte orderings used by these machines.
Byte ordering:
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 |
Corresponding code from given question:
#include <stdio.h>
//Define variable "byte_pointer" in char datatype.
typedef unsigned char* byte_pointer;
//Function definition for show_bytes.
void show_bytes(byte_pointer start, size_t len)
{
//Declare variable "i" in int data type.
int i;
/* "For" loop to determine byte representation in hexadecimal */
for (i = 0; i < len; i++)
//Display each bytes in "2" digits hexadecimal value.
printf(" %.2x", start[i]);
printf("\n");
}
//Function to determine byte for "int" number.
void show_int(int x)
{
//Call show_bytes function with integer value.
show_bytes((byte_pointer) &x, sizeof(int));
}
//Function to determine byte for "float" number.
void show_float(float x)
{
//Call show_bytes function float value.
show_bytes((byte_pointer) &x, sizeof(float));
}
//Function to determine byte for "pointer" number.
void show_pointer(void *x)
{
//Call show_bytes function with pointer value.
show_bytes((byte_pointer) &x, sizeof(void *));
}
//Test all show bytes.
void test_show_bytes(int val)
{
//Define variables.
int ival = val;
float fval = (float) ival;
int *pval = &ival;
//Call function.
show_int(ival);
show_float(fval);
show_pointer(pval);
}
//Main function.
int main(int argc, char* argv[])
{
//Define the sample number.
int sampleNumber = 682402;
//Call test_show_bytes function.
test_show_bytes(sampleNumber);
return 0;
}
The given program is used to display the byte representation of different program objects by using the casting.
Byte ordering used by the given machines:
After compiling and running the above code, the following output will be appear
a2 69 0a 00
20 9a 26 49
3c cc e9 18 ff 7f 00 00
From the above output,
The byte ordering used by these machines is “big-endian”.