循环1

object basic22 {
  def main(args:Array[String]):Unit={
    print("输入n的值，(大于等于3):")
    val n = scala.io.StdIn.readInt()
    var a = 1
    var b = 1
    println(s"第${1}项是:1")
    println(s"第${2}项是:1")
    for(i<- 3 to n){
      val c = a+b
      println(s"第${1}项是: ${c}")
      a = b
      b = c
    }
  }

}