feat:

线下课：
1、变量和数据类型
2、运算符

ChatGPT Scala 第 1 课：
变量、类型、条件判断

src/main/scala/demo3/DemoOps.scala

@@ -0,0 +1,48 @@
+package demo3
+
+object DemoOps {
+  def main(args: Array[String]): Unit = {
+
+    // 1.算术运算符
+    val result1: Int = 10 / 3 //3
+    println(s"result1 = ${result1}") //不能整除，取整数部分
+
+    val result2: Double = 10 / 3
+    println(s"result2 = ${result2}") // 两个整数做除法，结果也是证书，赋值给result2时，转成double 10/3 = 3 == 3。0
+
+    val result3: Double = 10.0 / 3
+    println(s"result3 = ${result3}") // double除以整形 10.3 / 3 ==> 10.0/3.0 ==> 3.33333
+
+    val result4: Int = (+10) + (-3)
+    println(s"result4 = ${result4}")
+
+    // 2.比较运算符
+    val a1: Int = 10
+    val b1: Int = 10
+    println(s"a1==b1 = ${a1 == b1}")
+    println(s"a1.equals(b1) = ${a1.equals(b1)}")
+    println(s"a1 != b1 = ${a1 != b1}")
+    println(s"a1>b1 = ${a1 > b1}")
+    println(s"a1 >= b1 = ${a1 >= b1}")
+
+    // 3.逻辑运算符
+    val n = 1
+    println((6 > 5) && (n > 0))
+    println((6 > 5) && (n < 0))
+    println((6 > 5) || (n > 0))
+    println((6 > 5) || (n < 0))
+    println(!((6 > 5) && (n > 0)))
+
+    // 4.赋值运算符
+    var a = 10
+    a += 1 // a = a + 1
+    println(a)
+    a -= 1
+    a /= 1
+    a %= 1
+
+
+
+  }
+
+}