八个字节的数组表示一个unsigned long long变量

#include <iostream>

#include <fstream>

using namespace std;



int main()

{



unsigned char * array = new unsigned char[8];





array[0]=0x32;

cout << hex <<(int)array[0]<<" ";



for(int i=1;i<8;i++)

{

        array[i]=array[i-1]+2;

        cout <<hex<<(int)array[i]<< " ";

}

cout<<endl;





unsigned long long result;

unsigned long long result1;

unsigned long long result2;



         cout << "array[0] >> 56 = " << (array[0] << 56) <<endl;



        result1 = (array[0] <<24) ^ (array[1] <<16)^ (array[2] << 8) ^ array[3];

        result2 = (array[4] <<24) ^ (array[5] <<16)^ (array[6] << 8) ^ array[7] ;

        cout << result1 << endl;

        cout << result2 << endl;

        result = (result1<<32)^result2;

        cout << dec <<(unsigned long long)result;


        return 0;
}

output:

32 34 36 38 3a 3c 3e 40 

array[0] >> 56 = 32000000

32343638

3a3c3e40

3617576015808446016