# Calculating the GCD
You can also browse this source code online and clone the wasmtime
repository to run the example locally:
* [Rust](https://github.com/bytecodealliance/wasmtime/blob/main/examples/gcd.rs)
* [C](https://github.com/bytecodealliance/wasmtime/blob/main/examples/gcd.c)
* [C++](https://github.com/bytecodealliance/wasmtime/blob/main/examples/gcd.cc)
This example shows off how run a wasm program which calculates the GCD of two
numbers.
## Wasm Source
```wat
{{#include ../examples/gcd.wat}}
```
## Host Source
```rust
{{#include ../examples/gcd.rs}}
```
```c
{{#include ../examples/gcd.c}}
```
```cpp
{{#include ../examples/gcd.cc}}
```