I want to get the low 32 bit of a int64 as int32

int64
qingsong picture qingsong · Sep 19, 2009 · Viewed 41.3k times · Source

I have an Int64 value, but I only need the lower 32 bits. Thus I want a quick way to get the Int32 value from the lower 32 bits of the Int64 value.

Thanks

Answer

Nick Dandoulakis picture Nick Dandoulakis · Sep 19, 2009

If you assign a int64 value into a int32 value, the compiler will automatically do that for you
(as Steven Sudit mentioned):

int64 val64 = ...;
int32 val32 = ...;
...

val32 = val64; // get the low 32 bits
// or
val32 = (val64 >> 32); // get the high 32 bits

and because the compiler may display warnings you can specify the cast

val32 = (int32)val64;

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