Exercise - Computed Properties and Property Observers The Rectangle struct below has two properties, one for width and one for height. Add a computed property that computes the area of the rectangle (i.e. width * height). Create an instance of Rectangle and print the area property. 6 struct Rectangle { var width: Int 8 var height: Int 9 10 } 11 12 In the Height struct below, height is represented in both inches and centimeters. However, if heightInInches is changed, heightInCentimeters should also adjust to match it. Add a didSet to each property that will check if the other property is what it should be, and if not, sets the proper value. If you set the value of the other property even though it already has the right value, you will end up with an infinite loop of each property setting the other. Create an instance of Height and then change one of its properties. Print out the other property to ensure that it was adjusted accordingly. 18 struct Height { 19 var heightInInches: Double 20 21 var heightInCentimeters: Double 22 23 init(heightInInches: Double) { self.heightInInches = heightInInches self.heightInCentimeters = heightInInches*2.54 24 25 26 27 init(heightInCentimeters: Double) { self.heightInCentimeters = heightInCentimeters self.heightInInches = heightInCentimeters/2.54 28 29 30 31 32 }
Exercise - Computed Properties and Property Observers The Rectangle struct below has two properties, one for width and one for height. Add a computed property that computes the area of the rectangle (i.e. width * height). Create an instance of Rectangle and print the area property. 6 struct Rectangle { var width: Int 8 var height: Int 9 10 } 11 12 In the Height struct below, height is represented in both inches and centimeters. However, if heightInInches is changed, heightInCentimeters should also adjust to match it. Add a didSet to each property that will check if the other property is what it should be, and if not, sets the proper value. If you set the value of the other property even though it already has the right value, you will end up with an infinite loop of each property setting the other. Create an instance of Height and then change one of its properties. Print out the other property to ensure that it was adjusted accordingly. 18 struct Height { 19 var heightInInches: Double 20 21 var heightInCentimeters: Double 22 23 init(heightInInches: Double) { self.heightInInches = heightInInches self.heightInCentimeters = heightInInches*2.54 24 25 26 27 init(heightInCentimeters: Double) { self.heightInCentimeters = heightInCentimeters self.heightInInches = heightInCentimeters/2.54 28 29 30 31 32 }
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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How do I solve this especially by adding a didSet with Swift code? 7 of 10
Transcribed Image Text:Exercise - Computed Properties and Property Observers
The Rectangle struct below has two properties, one for width and one for height. Add a computed property that computes the area of the rectangle (i.e. width * height). Create
an instance of Rectangle and print the area property.
struct Rectangle {
var width: Int
var height: Int
7
8.
9.
10
}
11
12
In the Height struct below, height is represented in both inches and centimeters. However, if heightInInches is changed, heightInCentimeters should also adjust to
match it. Add a didSet to each property that will check if the other property is what it should be, and if not, sets the proper value. If you set the value of the other property even
though it already has the right value, you will end up with an infinite loop of each property setting the other.
Create an instance of Height and then change one of its properties. Print out the other property to ensure that it was adjusted accordingly.
18
struct Height {
19
var heightInInches: Double
20
21
var heightInCentimeters: Double
22
init(heightInInches: Double) {
self.heightInInches
self.heightInCentimeters = heightInInches*2.54
23
24
heightInInches
%3D
25
26
}
27
init(heightInCentimeters: Double) {
self.heightInCentimeters
self.heightInInches = heightInCentimeters/2.54
28
29
heightInCentimeters
%D
30
31
}
32
}
33
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