# Example 1: Export C Functions to WASM

## The "basic" sample project

This sample demonstrates a few basic usages of embedding WAMR:

* initialize runtime
* load wasm app and instantiate the module
* call wasm function and pass arguments
* export native functions to the WASM apps
* wasm function calls native function and pass arguments
* deinitialize runtime

## Build this sample

Execute the `build.sh` script then all binaries including wasm application files would be generated in 'out' directory.

```
$ ./build.sh
```

## Run the sample

Enter the out directory.

```
$ cd ./out/
$
$ ./basic -f wasm-apps/testapp.wasm
calling into WASM function: generate_float
Native finished calling wasm function generate_float(), returned a float value: 102009.921875f
calling into WASM function: float_to_string
calling into native function: intToStr
calling into native function: get_pow
calling into native function: intToStr
Native finished calling wasm function: float_to_string, returned a formatted string: 102009.921
```

Or execute the `run.sh` script in `samples/basic` folder.

```
$ ./run.sh
calling into WASM function: generate_float
Native finished calling wasm function generate_float(), returned a float value: 102009.921875f
calling into WASM function: float_to_string
calling into native function: intToStr
calling into native function: get_pow
calling into native function: intToStr
Native finished calling wasm function: float_to_string, returned a formatted  string: 102009.921
```


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