The concept of the small end of big endian

Source: Internet
Author: User

For a 16-bit integer consisting of 2 bytes, there are two ways to store these two bytes in memory: One is to store the low-order bytes at the start address, which is called the small-end (Little-endian) byte order, and the other is to store the high-order bytes at the start address, which is called the big-endian (Big-endian ) byte order. The term "small end" and "big endian" indicate which end (small or big) of multiple byte values is stored at the starting address of the value.

#define _CRT_SECURE_NO_WARNINGS 1


#include <stdlib.h>

#include <stdio.h>

int main ()

{

Union

{

Short S;

Char c[sizeof (short)];

} un;

UN.S = 0x0102;

if (sizeof (short) = = 2)

{

if (un.c[0] = = 1 && un.c[1] = = 2)

printf ("big-endian\n");

else if (un.c[0] = = 2 && un.c[1] = = 1)

printf ("little-endian\n");

Else

printf ("unknown\n");

}

Else

printf ("sizeof (short) =%d\n", sizeof (short));

Exit (0);

System ("pause");

}

The above is a detection of small end of the program.

The concept of the small end of big endian

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