C + + judgment is big or small end storage

1. Distinguish big end small ends:

The low memory address stores the high level of data, which is the big-endian storage.
Low memory addresses store data low, that is, small-end storage.

2, the following figure can be clearly understood

3, C + + code validation big or small end storage

#include <iostream>

using namespace std;
int main ()
{
    int nnum = 0x12345678;
    Char chdata = * (char*) (&nnum);

    if (Chdata = = 0x12)
    {
        cout << "Big" << Endl;
    }
    else
    {
        cout << "small" << Endl;
    }

    System ("PAUSE");

    return 0;
}