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# PRInt64
Guaranteed to be a signed 64-bit integer on all platforms.
## Syntax
```{code}
#include <prtypes.h>
typedef definition PRInt64;
```
## Description
May be defined in several different ways, depending on the platform. For
syntax details for each platform, see
{searchfox}`prtypes.h <nsprpub/pr/include/prtypes.h>`.