เริ่มต้นใช้งานเริ่มต้นใช้งานได้ฟรี

if and else inside of a function

Since if expressions result in values, they can be the result of functions, which also result in values.

In this exercise, you'll create the body a function for your Twenty-One program called pointsToBust, which takes the current hand's point value as an input and calculates the the number of points remaining until 21. As a player, knowing how many additional points it takes to cause your current hand to bust will help you decide whether to hit or stay. The card variables you need and the bust function are already defined for you.

แบบฝึกหัดนี้เป็นส่วนหนึ่งของหลักสูตร

Introduction to Scala

ดูคอร์ส

คำแนะนำการฝึกหัด

  • Write an if condition: if the hand busts, make the Int 0 the result of the function.
  • Write an else condition: if the hand does not bust, subtract hand from 21 and make that difference the result of the function.
  • Call pointsToBust with a hand with the cards tenSpades and fiveClubs as the argument.

แบบฝึกหัดเชิงโต้ตอบแบบลงมือทำ

ลองทำแบบฝึกหัดนี้โดยเติมโค้ดตัวอย่างนี้ให้สมบูรณ์

// Find the number of points that will cause a bust
def pointsToBust(hand: Int): Int = {
  // If the hand is a bust, 0 points remain
  ___ ___
    ___
  // Otherwise, calculate the difference between 21 and the current hand
  ___
    ___
}

// Test pointsToBust with 10♠ and 5♣
val myHandPointsToBust = ___
println(myHandPointsToBust)
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