64 Bitwise AND

**Lostsheep** · 06-14-2008

I am completely lost... Why is tmpi always 0? It works just fine when using 32 bit ints. I am compiling the project in Visual Studio 2008 in 64 bit release mode and running it on a quad core machine with 64 bit vista. Shift operations seem to work just fine .

Code:

typedef unsigned __int64 uint64;

uint64 tmpc= 16,tmpe=  13,tmpD= 12, tmpi=5;

 tmpi= tmpc &  tmpe;

printf ("tmpi = %I64d \n", tmpi);

**iMalc** · 06-14-2008

Originally Posted by Lostsheep

I am completely lost... Why is tmpi always 0? It works just fine when using 32 bit ints. I am compiling the project in Visual Studio 2008 in 64 bit release mode and running it on a quad core machine with 64 bit vista. Shift operations seem to work just fine .

Code:

typedef unsigned __int64 uint64;

uint64 tmpc= 16,tmpe=  13,tmpD= 12, tmpi=5;

 tmpi= tmpc &  tmpe;

printf ("tmpi = &#37;I64d \n", tmpi);

What do you mean "works fine when using 32 bit ints"? It will correctly give zero regardless of the size of the integer you use, because 16 (10000 in binary) and 13 (1101 in binary) is zero:

Code:

  10000
& 01101
-------
  00000

**gltiich** · 06-16-2008

this is exactly why i still love my notebook and pencil

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