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Imagine you have an app that asks the user to enter his/her age using the keyboard. When your app allows a user to input text, what is captured for you is given as a String. Howeve: want to store this information as an Int. Is it possible for the user to make a mistake and for the input to not match the type you want to store? Declare a constant userInputAge of type String and assign it "34e" to simulate a typo while typing age. Then declare a constant userAge of type Int and set its value using the In initializer that takes an instance of String as input. Pass in userInputAge as the argument for the initializer. What error do you get? Go back and change the type of userAge to Int?, and print the value of userAge. Why is userAge's value nil? Provide your answer in a comment or print statement below. Now go back and fix the typo on the value of userInputAge. Is there anything about the value printed that seems off? Print userAge again, but this time unwrap userAge using the force unwrap operator. Now use optional binding to unwrap userAge. If userAge has a value, print it to the console.

Imagine you have an app that asks the user to enter his/her age using the keyboard. When your app allows a user to input text, what is captured for you is given as a String. Howeve: want to store this information as an Int. Is it possible for the user to make a mistake and for the input to not match the type you want to store? Declare a constant userInputAge of type String and assign it "34e" to simulate a typo while typing age. Then declare a constant userAge of type Int and set its value using the In initializer that takes an instance of String as input. Pass in userInputAge as the argument for the initializer. What error do you get? Go back and change the type of userAge to Int?, and print the value of userAge. Why is userAge's value nil? Provide your answer in a comment or print statement below. Now go back and fix the typo on the value of userInputAge. Is there anything about the value printed that seems off? Print userAge again, but this time unwrap userAge using the force unwrap operator. Now use optional binding to unwrap userAge. If userAge has a value, print it to the console.

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Imagine you have an app that asks the user to enter his/her age using the keyboard. When your app allows a user to input text, what is captured for you is given as a String. However, you want to store this information as an Int. Is it possible for the user to make a mistake and for the input to not match the type you want to store? Declare a constant userInputAge of type String and assign it "34e" to simulate a typo while typing age. Then declare a constant userAge of type Int and set its value using the Int initializer that takes an instance of String as input. Pass in userInputAge as the argument for the initializer. What error do you get? Go back and change the type of userAge to Int?, and print the value of userAge. Why is userAge's value nil? Provide your answer in a comment or print statement below. Now go back and fix the typo on the value of userInputAge. Is there anything about the value printed that seems off? Print userAge again, but this time unwrap userAge using the force unwrap operator. Now use optional binding to unwrap userAge. If userAge has a value, print it to the console.
Transcribed Image Text:Imagine you have an app that asks the user to enter his/her age using the keyboard. When your app allows a user to input text, what is captured for you is given as a String. However, you want to store this information as an Int. Is it possible for the user to make a mistake and for the input to not match the type you want to store? Declare a constant userInputAge of type String and assign it "34e" to simulate a typo while typing age. Then declare a constant userAge of type Int and set its value using the Int initializer that takes an instance of String as input. Pass in userInputAge as the argument for the initializer. What error do you get? Go back and change the type of userAge to Int?, and print the value of userAge. Why is userAge's value nil? Provide your answer in a comment or print statement below. Now go back and fix the typo on the value of userInputAge. Is there anything about the value printed that seems off? Print userAge again, but this time unwrap userAge using the force unwrap operator. Now use optional binding to unwrap userAge. If userAge has a value, print it to the console.
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