Weird bit-shift behavior

value >> 12
value & 0x00000FFF

6844268 = 11010000110111101101100
>> 12   =             11010000110.111101101100
result  =             11010000110
result  = 2 + 4 + 128 + 512 + 1024 = 1670

  18273       =   100011101100001
6844268 >> 12 =       11010000110
                        ^^^^  ^^^ <-- mismatches

sock@thebrain:~$ g++ test.cc
sock@thebrain:~$ ./a.out
6844268 1670 1670
6844268 1670 1670

sock@thebrain:~$ cat test.cc
#include <iostream>
#include <stdio.h>
using namespace std;
int main()
{
unsigned int value = 6844268;
printf("%u %u %un", value, value >> 12, (value >> 12)&0xFFF);
cout << value << " ";
cout << (value>>12) << " ";
value = (value>>12)&0xFFF;
cout << value << endl;
return 0;
};

[Function signature: const unsigned char *src, int len, char *dst]
unsigned short *sdst = (unsigned short*) dst;
unsigned short *slt = (unsigned short*) lookup_ext;

while (len >= 3) {
    unsigned int value = *src++ << 16;
    value |= *src++ << 8;
    value |= *src++;

    cout << value << endl;
    *sdst++ = slt[value >> 12];
    *sdst++ = slt[value & 0x00000FFF];

    cout << sizeof(unsigned short) << endl << slt[value >> 12] << endl << slt[value & 0x00000FFF] << endl;
    len -= 3;
}

6844268 | cout << value
2 | sizeof(unsigned short)
18273 | slt... Ohhhh sneaky. I mis-pasted that, nevermind - it's an slt issue [Output's the same now]
29497