[4.1.函數介紹](4.1.%E5%87%BD%E6%95%B0%E4%BB%8B%E7%BB%8D.md) [4.2.函數定義和調用](4.2.%E5%87%BD%E6%95%B0%E5%AE%9A%E4%B9%89%E5%92%8C%E8%B0%83%E7%94%A8.md) [4.3.函數的文檔說明](4.3.%E5%87%BD%E6%95%B0%E7%9A%84%E6%96%87%E6%A1%A3%E8%AF%B4%E6%98%8E.md) [4.4.函數參數(一)](4.4.%E5%87%BD%E6%95%B0%E5%8F%82%E6%95%B0%E4%B8%80.md) [4.5.函數返回值(一)](4.5.%E5%87%BD%E6%95%B0%E8%BF%94%E5%9B%9E%E5%80%BC%E4%B8%80.md) [4.6.函數的嵌套調用](4.6.%E5%87%BD%E6%95%B0%E7%9A%84%E5%B5%8C%E5%A5%97%E8%B0%83%E7%94%A8.md) [4.7.函數應用：打印圖形和數學計算](4.7.%E5%87%BD%E6%95%B0%E5%BA%94%E7%94%A8%EF%BC%9A%E6%89%93%E5%8D%B0%E5%9B%BE%E5%BD%A2%E5%92%8C%E6%95%B0%E5%AD%A6%E8%AE%A1%E7%AE%97.md)