How I can get this crc32 using zlib

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C++

ZLib

How i can get the crc32 of a

ULONGLONG

using zlib?

What I have tried:

char * token;

char * getcrc(ULONGLONG var)
{
unsigned long crc = crc32(0, (const Bytef*)&var, sizeof(__int64));

token = new char[1000];
sprintf(token, "CRC: %u", crc);

return token;
}