feat:线下课：流程控制、方法和函数

ChatGPT:第 2 课：Scala 函数与方法

src/main/scala/practise1/exercises/Exercises3.scala

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+package practise1.exercises
+
+object Exercises3 {
+  def main(args: Array[String]): Unit = {
+    /*    练习 3：计算两个数
+
+        定义：
+        val a = 10
+        val b = 20
+
+        输出：
+        10 + 20 = 30
+        10 - 20 = -10
+        10 * 20 = 200
+        10 / 20 = 0.5*/
+
+    val a = 10
+    val b = 20
+
+    println(s"${a}+${b} = ${a + b}")
+    println(s"${a}-${b} = ${a - b}")
+    println(s"${a}*${b} = ${a * b}")
+    println(s"${a}/${b} = ${a.toDouble / b}")
+  }
+
+}