endianness

#include <iostream>

using namespace std;

int main()
{
    int data_in_register = 0x0A0B0C0D;
    char little_endian_data[4] = {0x0D, 0x0C, 0x0B, 0x0A};
    char big_endian_data[4] = {0x0A, 0x0B, 0x0C, 0x0D};

    int num = 0;
    int i;

    for(i = 0; i < 4; i++)
        num += little_endian_data[i]<<i*8;

    if (num == data_in_register)
        cout << "little endian version works." << endl;

    num = 0;
    for (i = 0; i < 4; ++i)
    {
        num <<= 8;
        num |= big_endian_data[i];
    }

    if (num == data_in_register)
        cout << "big endian version works." << endl;


    return 0;
}