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## nng_aio_set_output
Set output result.
### Synopsis
```c
#include <nng/nng.h>
void nng_aio_set_output(nng_aio *aio, unsigned int index, void *result);
```
### Description
The `nng_aio_set_output` function sets the output result at _index_ to _result_ for the asynchronous operation associated with _aio_.
The type and semantics of output results are determined by specific operations.
The operation must supply appropriate output results when the operation completes successfully.
The valid values of _index_ range from zero (0) to three (3), as no operation currently defined can return more than four results.
Attempts to set results with an _index_ greater than three (3) will be ignored.
An output result set with this function may be retrieved later with
the xref:nng_aio_get_output.adoc[`nng_aio_get_output`] function.
### See Also
xref:nng_aio_get_input.adoc[nng_aio_get_inpput],
xref:../aio/nng_aio_get_output.adoc[nng_aio_get_output]
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