# Write a program that allows the user to enter an unsigned integer (the maximum value of…

Write a program that allows the user to enter an unsigned
integer (the maximum value of an unsigned 4-byte int is
232 = 4,294,967,296) and reverses its format (from
little to big endian, or vice versa). Print out the user-entered
number in hexadecimal and binary, reverse the endianness, and print
the reverse in hexadecimal and binary.
Integers in most machine architectures are represented in
little endian format: the least significant byte
is stored in the smallest address; for instance, the decimal number
23456789 is 0165EC15 in hex. In little endian format the number is
stored in main memory as follows:

Byte (in hex)

15

EC

65

01

a

a+1

a+2

a+3

In big endian format the 4-byte integer is
stored with the most significant byte is stored in the least

Byte (in hex)

01

65

EC

15

a

a+1

a+2

a+3

You may NOT use the C++ hex formatting capability of the
extraction operator (<<). Write your own routines to print a number in hexadecimal and binary using bit operators: <<, >>, &, |, and/or ~.
It is recommended that you use the following constants, a
union to represent 4-byte integers, and print
prototypes as shown here:
const int INTSIZE = 4; // in bytes
const int BYTESIZE = 8; // in bits
const int NIBSIZE = 4; // nibble, in bits
union integer4 {
unsigned int intrep;
unsigned char byterep[INTSIZE];
};
void prHex (unsigned char);
void prBin (unsigned char);
You will find that is very important that you use unsigned
chars. In most machine architectures, negative integers are
represented in 2s complement format with the most significant bit a
1. To convert a binary (byte) 1, or 00000001, to negative -1 in
binary, use the following procedure:
1)find the 1s complement; that is, flip all the 1s and 0s:
11111110;
2)add 1 to the result: 11111110 + 00000001 = 11111111, or
0xFF.
Hence a 0xFF as an unsigned char is 255 (decimal), and 0xFF as a
(signed) char is -1 (decimal).
Here is a sample run:
Enter an unsigned integer in base 10 => 23456789
In hex:
15 EC 65 01
In binary:
00010101 11101100 01100101 00000001
Reverse endian:
In hex:
01 65 EC 15
In binary:
00000001 01100101 11101100 00010101
code!

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