函数参数的使用

函数参数的使用

object inout42 {
  def hello(name:String="小明",age:Int=17,gender:String="女"):Unit = {
    println(s"hello, 我是${name},${age}岁,性别:${gender}")
  }
  def main(args:Array[String]):Unit = {
    hello("小花",18,"女")
    hello("小明",19,"男")
    hello("小花",18)
    hello()
  }
}

object inout42 {
  def hello(name:String="小明",age:Int=17,gender:String="女"):Unit = {
    println(s"hello, 我是${name},${age}岁,性别:${gender}")
  }
  def main(args:Array[String]):Unit = {
    hello("小花",18,"女")
    hello("小明",19,"男")
    hello("小花",18)
    hello()
    hello(age=18)
    hello(gender="男",name="小李")
    hello(gender="男",name="小李")
  }
}

定义函数的时候，不写（），那么在调用函数的时候，也不能写（）

def test:Unit = {
println("test......")
}
def main(args:Array[String]}:Unit = {
test
test()

允许参数的个数不同，类型相同

object inout43 {
  def getSum(args:Int*):Int = {
    var sum = 0
    for(i <- args){
      sum += i
    }
    sum
  }
  def main(args: Array[String]): Unit = {
    val result1 = getSum(1)
    val result2 = getSum(4,1,2,3,5)
    println(result1,result2)
  }
}

判断给定的三角形的三边，能否构成一个三角形？

object inout44 {
  def testTringle(a: Double, b: Double, c: Double): Boolean = {
    a + b > c && a + c > b && b + c > a
  }

  def isPrime(num: Int): Boolean = {
    var isPrimeNum = true
    for (i <- 2 to num - 1) {
      if (num % i == 0) {
        isPrimeNum = false
      }
    }
    isPrimeNum
  }

  def main(args: Array[String]): Unit = {
    val r = testTringle(1.0, 2.0, 2.0)
    println(r)

    var r1 = isPrime(9)
    println(r1)
  }
}