$ gcc -DHEXADECIMAL -o proj2 proj2.c
$ ./proj2

Input number: 287454020

Selection option:

        1 - Display number in hexadecimal
        2 - Exchange left most byte with right most byte
        3 - Exchange inner most bytes
        4 - Display number of set bits in each byte
        5 - Exit

Choice: 1

Number: 0x11223344

Selection option:

        1 - Display number in hexadecimal
        2 - Exchange left most byte with right most byte
        3 - Exchange inner most bytes
        4 - Display number of set bits in each byte
        5 - Exit

Choice: 2

Number Before: 0x11223344
Number After: 0x44223311

Selection option:

        1 - Display number in hexadecimal
        2 - Exchange left most byte with right most byte
        3 - Exchange inner most bytes
        4 - Display number of set bits in each byte
        5 - Exit

Choice: 3

Number Before: 0x44223311
Number After: 0x44332211

Selection option:

        1 - Display number in hexadecimal
        2 - Exchange left most byte with right most byte
        3 - Exchange inner most bytes
        4 - Display number of set bits in each byte
        5 - Exit

Choice: 4

Number: 0x44332211
Byte 0 Count: 2
Byte 1 Count: 2
Byte 2 Count: 4
Byte 3 Count: 2

Selection option:

        1 - Display number in hexadecimal
        2 - Exchange left most byte with right most byte
        3 - Exchange inner most bytes
        4 - Display number of set bits in each byte
        5 - Exit

Choice: 5

$ gcc -DBIN -o proj2 proj2.c
$ ./proj2

Input number: 287454020

Selection option:

        1 - Display number in binary
        2 - Exchange left most byte with right most byte
        3 - Exchange inner most bytes
        4 - Display number of set bits in each byte
        5 - Exit

Choice: 1

Number: 00010001001000100011001101000100

Selection option:

        1 - Display number in binary
        2 - Exchange left most byte with right most byte
        3 - Exchange inner most bytes
        4 - Display number of set bits in each byte
        5 - Exit

Choice: 2

Number Before: 00010001001000100011001101000100
Number After: 01000100001000100011001100010001

Selection option:

        1 - Display number in binary
        2 - Exchange left most byte with right most byte
        3 - Exchange inner most bytes
        4 - Display number of set bits in each byte
        5 - Exit

Choice: 3

Number Before: 01000100001000100011001100010001
Number After: 01000100001100110010001000010001

Selection option:

        1 - Display number in binary
        2 - Exchange left most byte with right most byte
        3 - Exchange inner most bytes
        4 - Display number of set bits in each byte
        5 - Exit

Choice: 4

Number: 01000100001100110010001000010001
Byte 0 Count: 2
Byte 1 Count: 2
Byte 2 Count: 4
Byte 3 Count: 2

Selection option:

        1 - Display number in binary
        2 - Exchange left most byte with right most byte
        3 - Exchange inner most bytes
        4 - Display number of set bits in each byte
        5 - Exit

Choice: 5

$