Define immutable variables (val)
Scala has two kinds of variables: val and var. val are immutable, which means once initialized, they can't be reassigned.
In Twenty-One, a val is like any non-ace card. That is, 2 through 10 (worth 2 through 10 points) and all face cards (jack, queen, and king are worth 10 points) all have the same point value throughout the game.
In this exercise, you will define variables for some non-ace cards, each as a val of type Int (one of the four most common value types for data-related tasks). In the next lesson, you'll learn why immutable variables are preferred in Scala.
本练习是课程的一部分
Introduction to Scala
练习说明
- Define variables for cards 2, 3, and 4 for the suit clubs (♣). Explicitly specify their type as
Int.
交互式实操练习
通过完成这段示例代码来试试这个练习。
// Define immutable variables for clubs 2♣ through 4♣
___ twoClubs: ___ = ___
___ threeClubs: ___ = ___
___ fourClubs: ___ = ___