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# nng_version
## NAME
nng_version --- report library version
## SYNOPSIS
```c
#include <nng/nng.h>
const char * nng_version(void);
```
## DESCRIPTION
The `nng_version()` function returns a human readable {{i:version number}}
for _NNG_.
Additionally, compile time version information is available
via some predefined macros:
- {{i:`NNG_MAJOR_VERSION`}}: Major version number.
- {{i:`NNG_MINOR_VERSION`}}: Minor version number.
- {{i:`NNG_PATCH_VERSION`}}: Patch version number.
_NNG_ is developed and released using
[Semantic Versioning 2.0](http://www.semver.org), and
the version numbers reported refer to both the API and the library itself.
(The {{i:ABI}} -- {{i:application binary interface}} -- between the
library and the application is controlled in a similar, but different
manner depending upon the link options and how the library is built.)
## RETURN VALUES
`NUL`-terminated string containing the library version number.
{{#include ../refs.md}}
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