# 07-函式
函式就是一段獨立的程式碼，有零個到多個輸入參數，而且也有零個到多個輸出參數。函式（也稱為 procedure 或 subroutine）通常使用一個黑盒子來表示：
到目前為止，我們在 Go 程式裡面只有用到一個函式：
```
func main() {}
```
現在我們會開始用多個函式來寫程式。
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